Puberty is the time during which the body undergoes changes that enable sexual reproduction. It is a gradual process that takes place over several years.
Hormonal changes at the onset of puberty that result in ovulation are as follows: Gonadotropin-releasing hormone (GnRH) is produced by the hypothalamus, which is located in the brain.
This hormone signals the pituitary gland to release follicle-stimulating hormone (FSH) and luteinizing hormone (LH).
FSH and LH are released by the pituitary gland. FSH stimulates the development of follicles in the ovary, which are sacs that contain eggs.
LH triggers ovulation, which is the release of an egg from the ovary into the fallopian tube.
This occurs approximately once a month during the menstrual cycle.
In conclusion, at the onset of puberty, the hypothalamus signals the pituitary gland to release FSH and LH, which cause the development of follicles in the ovary and ovulation, respectively.
GnRH, FSH, and LH all play a crucial role in regulating the menstrual cycle.
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In summary, GnRH stimulates the release of FSH and LH from the pituitary gland. FSH promotes the development of ovarian follicles, while LH triggers ovulation. These hormonal changes play a crucial role in the reproductive process during puberty.
During puberty, there are hormonal changes that occur in the body, leading to ovulation. One of the key players in this process is GnRH, or gonadotropin-releasing hormone. GnRH is released by the hypothalamus in the brain and signals the pituitary gland to release two other hormones, FSH (follicle-stimulating hormone) and LH (luteinizing hormone).
1. GnRH is secreted by the hypothalamus and stimulates the pituitary gland.
2. FSH is released by the pituitary gland in response to GnRH.
3. FSH stimulates the development of ovarian follicles, which are structures that contain eggs.
4. The follicles produce estrogen, a hormone that prepares the uterus for potential pregnancy.
5. As estrogen levels rise, it signals the pituitary gland to reduce the release of FSH and increase the release of LH.
6. LH surge triggers ovulation, which is the release of a mature egg from the ovary.
7. After ovulation, the follicle that released the egg transforms into a structure called the corpus luteum.
8. The corpus luteum produces progesterone, a hormone that prepares the uterus for implantation of a fertilized egg.
9. If fertilization does not occur, the corpus luteum degenerates, leading to a drop in progesterone levels and the start of a new menstrual cycle.
In summary, GnRH stimulates the release of FSH and LH from the pituitary gland. FSH promotes the development of ovarian follicles, while LH triggers ovulation. These hormonal changes play a crucial role in the reproductive process during puberty.
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Please use the question number when you are answering the each
question.
1- What is the significance of finding Baby Salem?
2- What clues were used to date the skull of Salem?
1. The significance of finding Baby Salem is its contribution to understanding human ancestry and the process of evolution.
2. The clues used to date the skull of Salem included geological context, stratigraphic layers, associated fauna, and comparison with other fossils.
1 Finding Baby Salem is significant because it represents the discovery of a fossil belonging to an early hominin, providing scientists with important clues about our evolutionary past. By studying the remains of ancient hominins like Baby Salem, researchers can gather information about their physical characteristics, behavior, and the environments they inhabited. This knowledge helps in reconstructing the evolutionary timeline of human ancestors and understanding the transitions and adaptations that occurred throughout human evolution. Additionally, the discovery of Baby Salem contributes to our understanding of the diversity of early hominin species and their distribution across different regions. It allows scientists to refine and expand their knowledge of the human family tree, providing valuable insights into our origins as a species.
2. The dating of the skull of Salem involved a combination of techniques and clues. Geological context played a crucial role, as the skull was found within specific layers of sedimentary rock. By analyzing the stratigraphic layers, scientists can estimate the age of the fossil-based on the geological time scale. Associated fauna, such as the presence of certain animal species, can also provide clues about the relative age of the fossil. Comparison with other known fossil finds is another important factor in dating the skull. By examining the similarities and differences between Baby Salem and other hominin fossils with established ages, scientists can infer the approximate age of the skull. These dating methods help establish the temporal context of Baby Salem and contribute to our understanding of the timeline of human evolution.
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1) Which type of study compares people with and without a disease?
a) Cohort b) Descriptive observational c) Case-control d) Ecologic
2) In which type of study is the group the level of analysis?
a) Cohort b) Descriptive observational c) Case-control d) Ecologic
3) Which of the following measures existing cases in a population?
a) Prevalence b) Delta c) Incidence d) Duration
4) What is the term for a disease or condition that is associated with a particular region?
a) Endemic b) Outbreak c) Cluster d) Epidemic
1) The study compares people with and without a disease, answer to this question is option c) Case-control. 2. The answer to this question is option a) Cohort. Cohort studies are observational in nature, meaning they are not conducted under controlled conditions. 3. The answer to this question is a) Prevalence. 4. The answer to this question is a) Endemic.
1) A case-control study is an observational study in which two existing groups varying in outcome are identified and compared based on some supposed causal attribute. Case-control studies are generally designed to determine if there is an association between the exposure to a particular risk factor and the outcome of interest. The investigator identifies the cases in the population who have the disease or outcome of interest and selects a group of suitable control individuals from the same population without the outcome of interest.
2)The answer to this question is a) Cohort. Cohort studies are observational in nature, meaning they are not conducted under controlled conditions. Cohort studies track one or more groups of individuals over time to assess an exposure or treatment's relationship with an outcome. They are often used to track disease incidence or the development of new outcomes. In cohort studies, the group is the level of analysis, and it is compared to another group.
3) The answer to this question is a) Prevalence. Prevalence measures existing cases in a population, reflecting the total number of individuals who have the condition, regardless of when they acquired it. It is a proportion of the number of individuals in the population with the disease at a particular time compared to the total number of people in the population.
4) The answer to this question is a) Endemic. Endemic diseases are those that are associated with a particular region or population. They are the illnesses that are present in a specific geographical location or population group. An endemic disease is one that is constantly present in a given population. An outbreak, on the other hand, is an epidemic limited to a small geographic area. A cluster is a grouping of disease cases that occur more frequently than expected in a given location and time.
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In the catabolism of saturated FAs the end products are H2O and CO2
a) Indicate the steps involved in the β-oxidation of stearic acid to acyl CoA and acetyl CoA.
b) How many rounds of β -oxidation does stearic acid have to undergo to be converted to acetyl CoA and how many moles of acetyl CoA are finally produced? Explain.
c) How many moles of NADH and FADH2 and thus ATP are produced in the conversion of stearic acid to acetyl CoA? Explain
d) If 12 moles of ATP are produced for each mole of acetyl CoA going through the CAC, how many moles of ATP will be obtained from the acetyl CoA produced in the β-oxidation of stearic acid?
e) What is the total ATP produced in the complete oxidation of 1 mole of stearic acid?
The β-oxidation of stearic acid to acyl CoA and acetyl CoA can be described as follows: Stearic acid first undergoes activation by reacting with CoA to form stearoyl CoA.
Stearic acid has 18 carbon atoms. In order to convert stearic acid to acetyl CoA, it has to undergo 8 rounds of β-oxidation. Each round of β-oxidation generates 1 molecule of acetyl CoA. Therefore, 8 moles of acetyl CoA will be produced from the β-oxidation of stearic acid. Each mole of acetyl CoA going through the CAC produces 12 moles of ATP. Therefore, the 8 moles of acetyl CoA produced from the β-oxidation of stearic acid will generate 8 x 12 = 96 moles of ATP.
The total ATP produced in the complete oxidation of 1 mole of stearic acid is the sum of the ATP produced from the β-oxidation of stearic acid and the ATP produced from the CAC. From part d, we know that 8 moles of acetyl CoA produced from the β-oxidation of stearic acid will generate 96 moles of ATP. In the CAC, each mole of acetyl CoA produces 12 moles of ATP. Therefore, the total ATP produced from the complete oxidation of 1 mole of stearic acid is 96 + (12 x 8) = 192 moles of ATP.
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A suspension of bacteriophage particles was serially diluted, and 0.1 mL of the final dilution was mixed with E. coli cells and spread on the surface of agar medium for plaque assay. Based on the results below, how many phage particles per mL were present in the original suspension?
Dilution factor
Number of plaques
106
All cells lysed
107
206
108
21
109
0
The solution to the given problem is:Given that a suspension of bacteriophage particles was serially diluted, and 0.1 mL of the final dilution was mixed with E. coli cells and spread on the surface of agar medium for plaque assay.
The table given below shows the number of plaques and the dilution factor.Number of plaquesDilution factor106All cells lysed10720610821Now, for finding the number of phage particles per mL in the original suspension, we need to use the formula as shown below:Formula to find the number of phage particles per mL = Number of plaques × 1/dilution factor.
Step 1: For the first dilution, the dilution factor is 106 and all cells are lysed.Hence, the number of phage particles present in the original suspension = 106 × 1/106= 1 phage particle/mLStep 2: For the second dilution, the dilution factor is 107, and the number of plaques formed is 206.Hence, the number of phage particles present in the original suspension = 206 × 1/107= 1.93 phage particles/mLStep 3: For the third dilution, the dilution factor is 108, and the number of plaques formed is 21.Hence, the number of phage particles present in the original suspension = 21 × 1/108= 0.194 phage particles/mLStep 4: For the fourth dilution, the dilution factor is 109, and no plaques are formed.Hence, the number of phage particles present in the original suspension = 0 × 1/109= 0 phage particles/mLTherefore, the original suspension contained 1 phage particle/mL + 1.93 phage particles/mL + 0.194 phage particles/mL + 0 phage particles/mL= 2.124 phage particles/mL.
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A transgenic organism is one in which DNA from a different organism is introduced to produce a biopharmaceutical its genes have transferred to new chromosomes DNA from a different organism is introduc
A transgenic organism is one that has DNA from a different organism introduced to produce a biopharmaceutical. The organism's genes have been transferred to new chromosomes.
In general, transgenic organisms have a great potential for many beneficial applications. One of the most important and widely studied applications of transgenic organisms is in the production of biopharmaceuticals. Biopharmaceuticals are drugs that are produced using living organisms, typically bacteria or yeast, that have been genetically engineered to produce the desired drug. In general, biopharmaceuticals are more effective than traditional chemical drugs, and are less likely to cause side effects.
The production of biopharmaceuticals is a complex and expensive process, but the use of transgenic organisms has the potential to greatly reduce costs. Transgenic organisms have also been used in the field of agriculture. For example, transgenic crops have been developed that are resistant to pests and diseases. This has the potential to greatly increase crop yields, reduce the use of pesticides, and reduce the environmental impact of agriculture. Overall, the use of transgenic organisms has great potential for many beneficial applications, and research in this area is likely to continue to grow in the coming years.
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34. The following protein functions as both a membrane receptor and a transcription factor:
Select one:
a. hedgehog
b. ß-catenin
c. frizzled
d. notch
e. Delta
35. The following structure coils into the embryo during gastrulation in Drosophila, but retracts toward the rear of the embryo at the end of gastrulation:
Select one:
a. amnioserosa
b. ventral groove
c. germ band
d. anterior intussusception
e. cephalic groove
34. The protein that functions as both a membrane receptor and a transcription factor is: β-catenin
35. The structure that coils into the embryo during gastrulation in Drosophila but retracts toward the rear of the embryo at the end of gastrulation is: amnioserosa
34. β-catenin is a versatile protein that plays a crucial role in various cellular processes, including cell adhesion, cell signaling, and gene regulation.
It acts as a key component of adherens junctions, where it facilitates cell-cell adhesion by linking cadherin proteins to the actin cytoskeleton. In this capacity, β-catenin functions as a membrane receptor.
In addition to its role in cell adhesion, β-catenin also has a nuclear function as a transcription factor. When certain signaling pathways are activated, such as the Wnt signaling pathway, β-catenin is stabilized and translocates into the nucleus.
There, it interacts with other transcription factors and co-activators to regulate the expression of target genes, influencing various cellular processes and developmental events.
35. During gastrulation in Drosophila, the amnioserosa is a specialized tissue that forms at the dorsal side of the embryo. It is involved in the shaping and movement of cells during early development.
The amnioserosa initially extends and coils inward, contributing to the invagination of the germ band, which is the precursor to the body segments.
However, as gastrulation progresses and germ band extension occurs, the amnioserosa retracts toward the rear of the embryo. This retraction is important for proper embryonic development and helps to establish the correct positioning and organization of the embryonic tissues.
The movement of the amnioserosa contributes to the overall morphogenetic changes that shape the developing embryo in Drosophila.
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Create a food chain for the production of fruit jams from farm
to fork. You can choose a specific fruit.
Your food chain should have at least 10 stages (include more if
u can). (5 marks)
State the s
The food chain for the production of strawberry jam involves stages such as strawberry farming, harvesting, sorting and washing, processing, cooking, sterilization, packaging, distribution, purchase, and consumption. Salmonella, Escherichia coli, and Clostridium botulinum are examples of microorganisms that can enter the food chain and pose a potential hazard to the safety of strawberry jam if preventive measures are not in place.
Food Chain: Production of Strawberry Jam from Farm to Fork
Strawberry Farm: Strawberries are grown on a farm.
Harvesting: Ripe strawberries are harvested from the farm.
Sorting and Washing: The harvested strawberries are sorted to remove damaged or unripe ones. They are then washed to remove dirt and debris.
Processing Facility: The strawberries are transported to a processing facility.
Preparing and Cutting: At the processing facility, the strawberries are prepared by removing the stems and cutting them into smaller pieces.
Cooking: The prepared strawberries are cooked in a large pot or kettle to extract their juices and develop the jam consistency.
Adding Sugar and Pectin: Sugar and pectin (a natural gelling agent) are added to the cooked strawberry mixture to enhance flavor and texture.
Sterilization: The jam mixture is heated to a high temperature to kill any harmful microorganisms and ensure its safety and shelf-life.
Packaging: The sterilized jam is transferred into jars or containers and sealed to prevent contamination.
Distribution: The packaged strawberry jam is distributed to retailers and supermarkets.
Purchase: Consumers buy the strawberry jam from the store.
Consumption: The strawberry jam is consumed by spreading it on bread or other food items.
Stages where microbial hazards can enter:
Harvesting: Microbial hazards can enter during the harvesting process if the strawberries come into contact with contaminated soil, water, or equipment.
Sorting and Washing: If the sorting and washing processes are not conducted properly, contaminated water or equipment can introduce microbial hazards.
Processing Facility: If the processing facility lacks proper sanitation and hygiene practices, microbial hazards can contaminate the strawberries and the jam during various stages of processing.
Microorganisms that can enter the food chain:
Salmonella (Scientific name: Salmonella enterica): It is a common bacterial pathogen that can be found in contaminated water, soil, or animal feces.
Escherichia coli (Scientific name: Escherichia coli): Certain strains of E. coli, such as E. coli O157:H7, can cause foodborne illness and are commonly associated with fecal contamination.
Botulinum toxin (Scientific name: Clostridium botulinum): This toxin is produced by the bacterium Clostridium botulinum, which can thrive in improperly processed or canned food, including jams.
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Which statement below best describes a characteristic of an Alu
element?
a.Alu is typically transcribed by RNA pol III.
b.Alu is reverse transribed by L1 ORF1p.
c. Alu is an autonomous retrotransposon
Among the given statement, the best statement that describes a characteristic of an Alu element is "Alu is typically transcribed by RNA pol III."
Alu is the short interspersed nuclear element, which is 300 bp in length and is the most common repetitive element found in the human genome. Alu is classified under the group of retrotransposons, which are genetic elements that can move from one location to another location in the genome. Retrotransposons are the significant contributor to the genomic diversity of mammals.
Transcription of Alu elements, Alu elements are transcribed by RNA polymerase III (Pol III). RNA Pol III is a large complex enzyme that is responsible for the transcription of tRNAs, 5S rRNA, and other small untranslated RNA molecules.Alu elements are transcribed as RNA molecules, and these RNA molecules are the primary source of various small RNA molecules found in cells. After transcription, Alu RNA molecules fold back on themselves and form a hairpin structure that is stabilized by base pairing. These hairpin structures are recognized by the RNA-processing machinery, which cleaves them into small RNA molecules called Alu RNAs. Therefore, the correct statement among the given statement is "Alu is typically transcribed by RNA pol III."
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How is the costimulatory molecule different for T1-2 antigens (what provides the costimulatory signal)?
A CD40L
B mitogen
c. extensive receptor cross-linking
D 87
What does perforin do?
A
Activate B cells
B) Protein that forms pores in membrane
c. Causes inflammation
d. Transports antigen to the lymph nodes
B). Costimulatory molecules play an important role in the activation of T cells. When an antigen binds to a T cell receptor, it sends an activation signal to the T cell. However, this signal is not enough to fully activate the T cell. The costimulatory molecule provides a second signal to fully activate the T cell.
There are different costimulatory molecules for T1-2 antigens. The costimulatory molecule that provides the costimulatory signal for T1-2 antigens is extensive receptor cross-linking. This is a type of signal that occurs when a large number of antigens bind to the T cell receptors at the same time. This signal helps to ensure that the T cell is activated only when there is a high level of antigen present.
Perforin is a protein that forms pores in membranes. It is released by cytotoxic T cells and natural killer cells as part of the immune response. Perforin helps to destroy cells that have been infected by viruses or other intracellular pathogens. It does this by creating pores in the cell membrane, which causes the cell to lose its structural integrity and die.
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To reproduce sexually, an organism must create haploid [1] cells, or [2], from diploid cells via a specialized cell division called [3]. During mating, the father's haploid cells, called [4] in animals, fuse with the mother's haploid cells, called [5]. Cell fusion produces a diploid cell called a [6], which undergoes many rounds of cell division to create the entire body of the new individual. The cells produced from the initial fusion event include [7] cells that form most of the tissues of the body as well as the [8]-line cells that give rise to the next generation of progeny. Allele, bivalent, germ, pedigree, pollen, meiosis, gametes, somatic, eggs, zygote, mitosis, sperm 1. 2. 3. 4. 5. 6. 7. 8.
1. gametes: Gametes are haploid cells that are involved in sexual reproduction. They contain half the number of chromosomes compared to diploid cells.
2. sperm: Sperm is the male gamete in animals. It is a specialized haploid cell produced by the male reproductive system.
3. meiosis: Meiosis is a specialized cell division process that occurs in reproductive cells to produce gametes. It involves two rounds of division, resulting in the formation of four haploid cells.
4. sperm: In animals, the father's haploid cells are called sperm. Sperm is produced in the testes and carries genetic information from the father.
5. eggs: In animals, the mother's haploid cells are called eggs. Eggs are produced in the ovaries and carry genetic information from the mother.
6. zygote: When the sperm and egg fuse during fertilization, they form a diploid cell called a zygote. The zygote contains a complete set of chromosomes (one set from each parent) and develops into a new individual.
7. somatic: Somatic cells are the non-reproductive cells in an organism that make up most of its body tissues. These cells are diploid and do not participate in the formation of gametes.
8. germ: Germ cells are the specialized cells that give rise to gametes. These cells undergo cell divisions to produce the next generation of progeny and are responsible for transmitting genetic information to offspring.
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Chemokines with a CC structure recruit mostly neutrophils O True False Question 73 Which of the following constitutes the anatomical barrier as we now know it? paneth cells mucosal epithelial cells sentinel macrophages the microbiome both b and c Question 74 T-cells "know" how to target mucosal tissues because of the following.. mAdCAM1 and alpha4-beta 7 interactions LFA-1 and ICAM1
Chemokines with a CC structure recruit mostly neutrophils. This statement is True.
Anatomical barriers are physical and chemical barriers that protect against harmful substances that could cause illness or infections. The two most common anatomical barriers are the skin and mucous membranes.
Mucosal epithelial cells and sentinel macrophages are the anatomical barriers as we now know it.
The answer is both b and c.T cells "know" how to target mucosal tissues because of the mAdCAM1 and alpha4-beta 7 interactions.
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Which statement regarding the absorption of lipid is true? triglyceride are absorbed into the circulatory system directly from the small intestine fatty acid and glycerol enter the intestinal cell in the form of chylomicron lipids are absorbed only in the ileum of the small intestine bile help transport lipids into the blood stream fatty acid and glycerol enter the intestinal cells in the form of micelle
The statement "fatty acid and glycerol enter the intestinal cells in the form of micelle" is true.
During lipid absorption, the breakdown products of triglycerides (fatty acids and glycerol) are absorbed by the small intestine. However, due to their hydrophobic nature, they cannot dissolve freely in the watery environment of the intestine. To facilitate their absorption, they combine with bile salts to form micelles. Bile salts are produced by the liver and stored in the gallbladder, and they aid in the digestion and absorption of dietary fats.
These micelles, consisting of fatty acids, glycerol, and bile salts, help solubilize the lipids and transport them to the surface of the intestinal cells (enterocytes). The fatty acids and glycerol then diffuse across the cell membrane and enter the enterocytes. Once inside the enterocytes, they are reassembled into triglycerides.
After reassembly, the triglycerides combine with other lipids and proteins to form chylomicrons. Chylomicrons are large lipoprotein particles that transport the dietary lipids through the lymphatic system and eventually into the bloodstream, where they can be utilized by various tissues in the body.
Therefore, it is correct to say that fatty acids and glycerol enter the intestinal cells in the form of micelles during lipid absorption.
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1. What are the single-letter and three-letter abbreviations for pyrrolysine? . Below are schematics of synthetic human proteins. Colored boxes indicate signal sequences. SKL, KDEL and KKAA are actual amino acid sequences. Answer the questions 2 to 6. (1) SKL (2) KDEL (3) KKAA (4) MTS (5) MTS GPI (6) MTS (7) SP KKAA (8) SP (9) SP (10) SP GPI (11) SP KDEL (12) SP SKL 2. Find all proteins that would be localized to the peroxisome. 3. Find all proteins that would be localized to the nucleus. 4. Find all proteins that would be associated with the cytoplamic membrane. 5. Find all proteins that would be targeted either to the lumen or membrane of the endoplasmic reticulum 6. Find all proteins that would be released from the cell. NLS NLS TM NLS TM
The single-letter and three-letter abbreviations for pyrrolysine are O and Pyl, respectively. Proteins are significant biomolecules that are present in living organisms. They have a wide range of functions that are critical to life, including catalyzing metabolic reactions, replicating DNA, and responding to stimuli, among other things.
What are proteins?
Proteins are composed of chains of amino acids that are connected by peptide bonds, with each chain of amino acids having a unique sequence of amino acids. Proteins can be targeted to different regions of the cell with the help of signal sequences. These signal sequences, which are usually short peptides at the amino or carboxyl terminus of the protein, serve as a "Zipcode" for the protein, allowing it to be sorted and delivered to its proper location within the cell.
Answers:2. Proteins that would be localized to the peroxisome: (4) MTS (5) MTS GPI (6) MTS3. Proteins that would be localized to the nucleus: (7) SP KKAA (8) SP (9) SP (10) SP GPI (11) SP KDEL (12) SP SKL4. Proteins that would be associated with the cytoplasmic membrane: (4) MTS (5) MTS GPI (6) MTS5. Proteins that would be targeted to the lumen or membrane of the endoplasmic reticulum: (3) KKAA (7) SP KKAA (8) SP (9) SP (10) SP GPI (11) SP KDEL (12) SP SKL6. Proteins that would be released from the cell:
(7) SP KKAA (8) SP (9) SP (10) SP GPI (11) SP KDEL (12) SP SKL
The single-letter and three-letter abbreviations for pyrrolysine are O and Pyl, respectively.
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Please help, will rate
Answer in 6-8 sentences
question 2: what is the Pfizer Vaccine composed of ? what does it target in SARS- CoV2 virus ? Can you connect it to any concept from Ch 17 in your course ?
The Pfizer vaccine, also known as the Pfizer-BioNTech COVID-19 vaccine, is composed of a small piece of the SARS-CoV-2 virus called messenger RNA (mRNA). This mRNA provides instructions for cells in the body to create a spike protein that is found on the surface of the virus. The vaccine does not contain the live virus itself.
Once the spike protein is produced by cells in the body, the immune system recognizes it as foreign and begins to produce antibodies and immune cells that can recognize and fight the virus if the person is exposed to it in the future.
This concept is covering the immune system and how it responds to infections and diseases. The Pfizer vaccine is an example of a vaccine that stimulates the immune system to produce a protective response against a specific pathogen. It is a type of active immunity, which involves the production of antibodies and immune cells by the body's own immune system.
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2.. Which of the following are not acute-phase protein? A. Serum amyloid A B. Histamine C. Prostaglandins D. Epinephrine 6.. Upon receiving danger signals from pathogenic infection, macrophages engage in the following activities except: A. Phagocytosis B. Neutralization C. Releasing cytokines to signal other immune cells to leave circulation and arrive at sites of infection D. Presenting antigenic peptide to T helper cells in the lymph nodes
Acute phase response The acute phase response is a generalized host response to tissue injury, inflammation, or infection that develops quickly and includes changes in leukocytes, cytokines, acute-phase proteins (APPs), and acute-phase enzymes (APEs) in response to injury, infection, or inflammation.
In response to a wi synthesizing de variety of illnesses and infections, the acute phase response is triggered by the liver and secreting various proteins and enzymes. Acute-phase proteins are a group of proteins that increase in concentration in response to inflammation. The following proteins are examples of acute-phase proteins: Serum Amyloid A (SAA), C-reactive protein (CRP), alpha 1-acid glycoprotein (AGP), haptoglobin (Hp), fibrinogen, complement components, ceruloplasmin, and mannose-binding lectin, among others. Except for histamine, all of the following substances are acute-phase proteins (APPs):Serum amyloid follows: n Phagocytosis Neutralization Presenting antigenic peptide to T helper cells in the lymph nodes Upon receiving danger signals from pathogenic infection,
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The case study reviews the research work of Losey and his collaborators. Their experiments involved Bt corn which is a crop genetically modified to produce a toxin (Bt) to eliminate pests that affect it. These experiments raised concerns about whether Bt crops could negatively impact non-target organisms (e.c. insects that are not crop pests, soil microorganisms, etc.) that provide ecosystem services. Since that time, hundreds of research papers have been conducted to clarify this concern. In this exercise, the student is expected to use databases to review the academic literature and identify one of those research papers. Instructions 1. The Web of Science database is recommended. 2. Identify an artide on the impact of Bt crops on non-target organisms.
The impact of Bt crops on non-target organisms is a very sensitive issue that has been under study for a long time. In their research, Losey and his colleagues tested Bt corn, a crop that has been genetically modified to produce a toxin (Bt) to get rid of pests that might affect it.
The results of their experiments raised concerns about whether Bt crops could negatively impact non-target organisms that provide ecosystem services (such as soil microorganisms and insects that are not crop pests). Hundreds of research papers have been conducted since then to clarify these concerns.
Therefore, the exercise requires students to use databases to review academic literature and find a research paper on the impact of Bt crops on non-target organisms.
An article on the impact of Bt crops on non-target organisms can be identified using the Web of Science database, which is recommended. The article that was selected is "Assessing the Effects of Bt Corn on Insect Communities in Field Corn."
The article reports on the long-term impact of Bt corn on non-target insects, and it demonstrates that the effects of Bt corn on non-target insects are not as severe as some have feared. The article presents a detailed methodology for assessing the effects of Bt corn on non-target insects, and it reports on the results of experiments conducted in different regions of the world, including the United States, Canada, and Europe.
The article provides evidence that Bt corn does not have significant negative impacts on non-target insects. However, it is important to note that the effects of Bt crops on non-target organisms are still an area of active research, and more work needs to be done to fully understand the implications of genetically modified crops on ecosystems. Therefore, it is important to keep studying and updating research on the impact of genetically modified crops on non-target organisms.
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Which of the following medical conditions are considered to be
disorders of the nervous system? Select all that apply.
1. Multiple sclerosis
2. Pericarditis
3. Cholecysitis
4. Epilepsy
5. Aphasia
Medical conditions that are considered disorders of the nervous system are multiple sclerosis, epilepsy and aphasia.
Here is a more elaborate answer on each of these conditions:
Multiple sclerosis (MS) is a demyelinating and degenerative disorder of the central nervous system. MS is a chronic and usually progressive disease that affects the myelin sheaths that surround the nerve fibers, causing a range of neurological symptoms. This disorder can affect any part of the central nervous system (CNS), including the brain, spinal cord, and optic nerves, but the most common site is the optic nerve. Some common symptoms of MS include vision problems, muscle weakness and stiffness, speech and swallowing difficulties, chronic pain, and fatigue.
Epilepsy is a group of neurological disorders characterized by seizures that can be triggered by various factors, such as a high fever, head injury, or drug use. The seizures are caused by abnormal electrical activity in the brain. Epilepsy can be a chronic condition that requires lifelong treatment, and the frequency and severity of seizures vary widely from person to person. Common symptoms of epilepsy include seizures, confusion, loss of consciousness, and muscle stiffness.
Aphasia is a communication disorder that is caused by damage to the language areas of the brain. It can affect a person's ability to speak, understand, read, and write. The severity of the disorder can vary widely, ranging from mild to severe. Some people with aphasia may have difficulty finding words or forming sentences, while others may be unable to speak at all. Aphasia can occur as a result of a stroke, head injury, or other medical conditions, such as brain tumors or infections. There are several types of aphasia, including expressive aphasia, receptive aphasia, and global aphasia.
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1. Describe the advantages to bacteria of living in a biofilm
2. Explain the relationship between quorum sensing and biofilm formation and maintenance
Advantages to bacteria of living in a biofilm.Biofilm has a number of advantages for bacteria. Biofilm is a surface-associated group of microorganisms that create a slimy matrix of extracellular polymeric substances that keep them together. The following are some of the benefits of living in a biofilm:Prevents Detachment: Biofilm protects bacteria from detachment due to fluid shear forces.
By sticking to a surface and producing a protective matrix, bacteria in a biofilm can prevent detachment from the surface.Protects from Antibiotics: Biofilm provides a protective barrier that inhibits antimicrobial activity. Bacteria in a biofilm are shielded from antimicrobial agents, such as antibiotics, that may otherwise be harmful.Mutual Support: The bacteria in a biofilm benefit from mutual support. For example, some bacteria can produce nutrients that others need to grow.
The biofilm matrix allows the transfer of nutrients and other substances among bacteria.Sharing of Genetic Material: Bacteria can swap genetic material with other bacteria in the biofilm. This exchange enables the biofilm to evolve rapidly and acquire new traits.Relationship between quorum sensing and biofilm formation and maintenanceQuorum sensing (QS) is a signaling mechanism that bacteria use to communicate with each other. It allows bacteria to coordinate gene expression and behavior based on their population density. Biofilm formation and maintenance are two processes that are influenced by QS. QS plays a significant role in the following two phases of biofilm development:1.
Biofilm Formation: Bacteria in a biofilm interact through signaling molecules known as autoinducers. If the concentration of autoinducers exceeds a certain threshold, it signals to the bacteria that they are in a group, and it is time to start forming a biofilm. Bacteria may use QS to coordinate the production of extracellular polymeric substances that are essential for biofilm formation.2. Biofilm Maintenance: QS is also critical for maintaining the biofilm structure. QS signaling molecules are used to monitor the population density within the biofilm. When the bacteria in the biofilm reach a particular threshold density, they begin to communicate with one another, triggering the production of matrix-degrading enzymes that break down the extracellular matrix. This process enables the bacteria to disperse and colonize other locations.
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Which of the following can occur in the presence of oxygen? 1) neither glycolysis nor cellular respiration 2) glycolysis and not cellular respiration 3) cellular respiration and not glycolysis 4) both glycolysis and cellular respiration
Both glycolysis and cellular respiration can occur in the presence of oxygen. Option 4 is correct answer.
Glycolysis is the initial step in the breakdown of glucose to produce energy. It occurs in the cytoplasm and can take place both in the presence and absence of oxygen. During glycolysis, glucose is converted into two molecules of pyruvate, resulting in the production of a small amount of ATP and NADH.
Cellular respiration, on the other hand, is the process that follows glycolysis and occurs in the mitochondria. It involves the complete oxidation of glucose and the production of ATP through oxidative phosphorylation. Cellular respiration includes two main stages: the citric acid cycle (also known as the Krebs cycle) and the electron transport chain. Both of these stages require oxygen as the final electron acceptor.
In the presence of oxygen, glycolysis is followed by cellular respiration. Pyruvate, the end product of glycolysis, enters the mitochondria and undergoes further oxidation in the citric acid cycle. This generates more ATP, along with NADH and FADH2, which then enter the electron transport chain to produce a large amount of ATP through oxidative phosphorylation.
Therefore, in the presence of oxygen, both glycolysis and cellular respiration can occur, leading to the efficient production of ATP for cellular energy needs.
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On average, over a long period of time genetic drift in a population will heritability of a trait. increase O decrease o not change change only the neutral alleles affecting O change only the additive
the effect of genetic drift on the heritability of a trait depends on the size of the population, the strength of selection, and other factors that can affect genetic variation. However, in general, genetic drift tends to reduce the heritability of a trait over time.
On average, over a long period of time, genetic drift in a population will cause the heritability of a trait to decrease. This is because genetic drift is a random process that can cause changes in allele frequencies in a population that are not related to the fitness or adaptability of those alleles.
In other words, genetic drift is a non-selective process that can lead to the loss of beneficial alleles and the fixation of harmful ones. As a result, genetic variation in a population can be reduced over time due to genetic drift, which in turn can reduce the heritability of a trait.
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Explain when a behavior (for example, a fear) becomes a diagnosable disorder What is a phobia? Can you name five specific ones with their medical terms? 2. What is the difference between aphagia and aphasia? 3. Define-acoustic, otic, achromatic vision, presbyopia. 4. Have you heard of LASIK surgery? Do you know what is involved?
When does a behavior become a diagnosable disorder? A behavior becomes a diagnosable disorder when it meets the following criteria:
The behavior or response is persistent and excessive, (2) the behavior results in significant distress or impairment, and (3) the behavior is not a result of a medication, substance abuse, or a medical condition. What is a phobia? A phobia is a type of anxiety disorder characterized by an excessive or irrational fear of a particular object or situation that causes significant distress and impairment in daily functioning. Five specific phobias with their medical terms are:(1) Arachnophobia (fear of spiders)(2) Acrophobia (fear of heights)(3) Claustrophobia (fear of confined spaces)(4) Agoraphobia (fear of open spaces or crowds)(5) Aerophobia (fear of flying)What is the difference between aphagia and aphasia? Aphagia is a medical term used to describe a disorder in which a person is unable to swallow food or liquids, while aphasia is a disorder in which a person is unable to communicate or understand language due to brain damage.
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It is well known that achondroplasia is an autosomal dominant trait, but the alle is recessive lethal. If an individual that has achondroplasia and type AB blood has a child with an individual that also has achondroplasia but has type B blood, what is the probability the child won't have achondroplasia themselves but will have type A blood?
The chance that the child won't have achondroplasia but will have type A blood is 50%. This assumes that the traits are independently inherited and there are no other influencing factors.
Achondroplasia is an autosomal dominant genetic disorder characterized by abnormal bone growth, resulting in dwarfism. The allele responsible for achondroplasia is considered recessive lethal, meaning that homozygosity for the allele is typically incompatible with life. Therefore, individuals with achondroplasia must be heterozygous for the allele. Given that one parent has achondroplasia and type AB blood, we can infer that they are heterozygous for both traits. The other parent also has achondroplasia but has type B blood, indicating that they too are heterozygous for both traits.
To determine the probability that their child won't have achondroplasia but will have type A blood, we need to consider the inheritance patterns of both traits independently. Since achondroplasia is an autosomal dominant trait, there is a 50% chance that the child will inherit the achondroplasia allele from either parent. However, since the allele is recessive lethal, the child must inherit at least one normal allele to survive. Regarding blood type, type A blood is determined by having at least one A allele. Both parents have a type A allele, so there is a 100% chance that the child will inherit at least one A allele. Combining these probabilities, the chance that the child won't have achondroplasia but will have type A blood is 50%. This assumes that the traits are independently inherited and there are no other influencing factors.
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Could you please assist with the below question based on doubling dilutions:
If the turbidity of an E.coli culture suggests that the CFU/ml is about 5x10^5, what would the doubling dilutions be that you plate out on an EMB medium using the spread plate technique to accurately determine the CFU/ml only using 3 petri dishes.
Thank you in advance!
the answer should be represented as 1/x, 1/y and 1/z.
this is all the information I have and not sure on how to go about in calculating the doubling dilution needed.
The dilution would be 250,000 CFU/ml, 125,000 CFU/ml, and 62,500 CFU/ml of 1/x, 1/y, and 1/z respectively.
The measure of the growth of a bacterial population or culture can be expressed as a function of an increase in the mass of the culture or the increase in the number of cells.
The increase in culture mass is calculated from the number of colony-forming units (CFU) visible in a liquid sample and measured by the turbidity of the culture.
This count assumes that each CFU is separated and found by a single viable bacteria but cannot distinguish between live and dead bacteria. Therefore, it is more practical to use the extended plate technique to distinguish between living and dead cells, and for this, an increase in the number of colony-forming cells is observed.
Starting from a culture with 5x10⁵ CFU/ml and using only 3 culture dishes.
The serial dilutions would be:
Take 1ml of the 5x10⁵ CFU/ml culture and put it in another tube with 1ml of pure EMB medium. The dilution would be 250,000 CFU/ml (1/2) or 1/x.Take 1 ml of the 250,000 CFU/ml dilution and put it in another tube with 1 ml of pure EMB medium. The dilution would be 125,000 CFU/ml (1/4) or 1/y.Take 1 ml of the 125,000 CFU/ml dilution and put it in another tube with 1 ml of pure EMB medium. The dilution would be 62,500 CFU/ml (1/8) or 1/z.The next step would be to take 100 microliters from each tube and do the extended plate technique in the 3 Petri dishes.
Thus, the dilution would be 250,000 CFU/ml (1/2), 125,000 CFU/ml (1/4), and 62,500 CFU/ml respectively.
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What are the sensory inputs to skeletal muscles and associated
structures?
The muscle spindles and Golgi tendon organs are the muscle's sensory receptors.
Thus, Muscle spindle secondary endings provide a less dynamic indication of muscle length, whereas muscle spindle main endings are sensitive to the rate and degree of muscle stretch.
Muscle force is communicated by the tendon organs. Skin receptors that are crucial for kinesthesia detect skin stretch, and joint receptors are sensitive to ligament and joint capsule stretch.
To provide impressions of joint movement and position, signals from muscle spindles, skin, and joint sensors are combined. The interpretation of voluntary actions during movement creation is likely accompanied by central signals (or corollary discharges).
Thus, The muscle spindles and Golgi tendon organs are the muscle's sensory receptors.
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Briefly describe a central nervous system (CNS) disorder characterised by decreased neurotransmitter activity in part of the brain, and critically evaluate the strengths and limitations of a pharmacological strategy to treat the symptoms of this disorder.
Parkinson's disease is one central nervous system (CNS) illness with diminished neurotransmitter activity. Dopamine-producing neurons in the substantia nigra region of the brain are the primary cause of it. Dopamine levels drop as a result, which causes tremors, stiffness, and bradykinesia as motor symptoms.
The administration of levodopa, a precursor to dopamine, is a pharmaceutical technique frequently used to treat the signs and symptoms of Parkinson's disease. The blood-brain barrier is crossed by levodopa, which is then transformed into dopamine to restore the levels that have been depleted. This helps many individuals live better lives by reducing their motor symptoms. The effectiveness of pharmacological treatment in controlling symptoms and its capacity to significantly relieve patients' symptoms are among its advantages. There are restrictions to take into account, though. Levodopa use over an extended period of time can result in changes in responsiveness and the development of motor problems. Additionally, the disease's own progression is not stopped or slowed down by it. Other pharmaceutical strategies, including as dopamine agonists and MAO-B inhibitors, are employed either alone or in conjunction with levodopa to overcome these limitations. To treat symptoms and enhance patient outcomes, non-pharmacological methods like deep brain stimulation and physical therapy are frequently used. Overall, pharmacological approaches are essential for controlling CNS illnesses, but for the best symptom control and disease management, a complete strategy that incorporates a variety of therapeutic modalities is frequently required.
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Vertebrate Phylogeny: overarching themes Be able to identify novel morphological innovations that distinguish the major vertebrate groups. Be able to construct an accurate, simple branch diagram that includes the major vertebrate groups and key diagnostic characters at each node and within each group. Example of a node- gnathostomes; characters-jaws, paired appendages, tetrameric hemoglobin, etc. Within group characters-e.g., Chondrichthyes; characters-placoid scales, cartilaginous endoskeleton. Sauropsid vs synapsid: distinguishing morphological differences (take an organ system approach-example: Compare and contrast the functional and structural patterns of skull morphology, jaw musculature, dentition, secondary palate, and muscle attachment sites between a typical sauropsid/diapsid and advanced synapsid amniote) How can embryology help decipher patterns of vertebrate phylogeny: use specific examples from various organ systems to support your answer. Think of recaptitulation in ontogeny of the vertebrate venous system or aortic arches.
Sauropsids and synapsids are two major clades of tetrapods. They are distinguished by a number of morphological features.
How to explain the informationSauropsid skulls have a single temporal opening, while synapsid skulls have two temporal openings.
Sauropsid skulls are more kinetic than synapsid skulls, meaning that they can move more freely.
Embryology can help decipher patterns of vertebrate phylogeny by studying the developmental patterns of different vertebrate groups.
The study of vertebrate phylogeny is a complex and fascinating field. By studying the morphological, developmental, and molecular evidence, scientists have been able to reconstruct the evolutionary history of vertebrates.
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Lower Limb Q28. The pulsation of dorsalis pedis artery is palpated at which of the following sites? A) Lateral to tendon of extensor hallucis longus. B) Behind the tendon of peroneus longus. C) In fro
The pulsation of the dorsalis pedis artery is palpated at the site lateral to the tendon of the extensor hallucis longus.
The dorsalis pedis artery is one of the main arteries that supplies blood to the foot. It is located on the dorsum (top) of the foot and can be palpated to assess the arterial pulsation.
To palpate the dorsalis pedis artery, one should position their fingers lateral to the tendon of the extensor hallucis longus. The extensor hallucis longus tendon runs along the top of the foot, and by moving slightly lateral to this tendon, the pulsation of the dorsalis pedis artery can be felt.
This is typically done at the midpoint between the extensor hallucis longus tendon and the lateral malleolus (the bony prominence on the outside of the ankle). By palpating the dorsalis pedis artery, healthcare professionals can assess the arterial blood supply to the foot and determine if there are any abnormalities or concerns related to circulation.
This examination technique is commonly used in clinical settings, such as during vascular assessments or when evaluating peripheral arterial disease.
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Proteins intended for the nuclear have which signal?
Proteins that are intended to be transported into the nucleus possess a specific signal sequence known as the nuclear localization signal (NLS). The NLS serves as a recognition motif for the cellular machinery responsible for nuclear import, allowing the protein to be selectively transported across the nuclear envelope and into the nucleus.
The nuclear localization signal ( can vary in its sequence but typically consists of a stretch of positively charged amino acids, such as lysine (K) and arginine (R), although other amino acids can also contribute to its specificity. The positively charged residues of the NLS interact with importin proteins, which are import receptors present in the cytoplasm, forming a complex that facilitates the transport of the protein through the nuclear pore complex. Once the protein-importin complex reaches the nuclear pore complex, it undergoes a series of interactions and conformational changes that enable its translocation into the nucleus. Once inside the nucleus, the protein is released from the importin and can carry out its specific functions, such as gene regulation, DNA replication, or other nuclear processes.
Overall, the nuclear localization signal is a crucial signal sequence that guides proteins to the nucleus, ensuring their proper cellular localization and allowing them to participate in nuclear functions.
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Which of the following is the correct order (pyruvate −> glucose) of the location(s) for gluconeogenesis in a liver cell? a. Mitochondria, endoplasmic reticulum, cytoplasm Endoplasmic reticulum, cytoplasm, b. mitochondria Mitochondria, cytoplasm, endoplasmic reticulum Cytoplasm, c. mitochondria, endoplasmic reticulum d. cytoplasm
The correct order (pyruvate −> glucose) of the location(s) for gluconeogenesis in a liver cell is in the cytoplasm, mitochondria, endoplasmic reticulum.
The process of gluconeogenesis is a metabolic pathway that takes place in the liver as well as the kidneys, and its function is to generate glucose from substances that are not carbohydrates, such as fatty acids, lactate, and amino acids. The process includes multiple steps, starting with pyruvate, which is converted to glucose by a series of enzymes.The correct order (pyruvate −> glucose) of the location(s) for gluconeogenesis in a liver cell is in the cytoplasm, mitochondria, endoplasmic reticulum. Gluconeogenesis begins with the conversion of pyruvate into oxaloacetate in the cytoplasm by pyruvate carboxylase, which is then transported into the mitochondria. Once inside the mitochondria, oxaloacetate is converted to phosphoenolpyruvate, which is transported back into the cytoplasm where it can be converted to glucose in the endoplasmic reticulum.
The correct order (pyruvate −> glucose) of the location(s) for gluconeogenesis in a liver cell is in the cytoplasm, mitochondria, endoplasmic reticulum. Gluconeogenesis is a metabolic pathway that occurs in the liver and kidneys and is responsible for generating glucose from non-carbohydrate substances such as fatty acids, lactate, and amino acids. It involves multiple steps starting with pyruvate, which is converted to glucose by a series of enzymes.
Gluconeogenesis is a complex process that requires the cooperation of multiple organelles in the liver cell, including the cytoplasm, mitochondria, and endoplasmic reticulum. The process begins with the conversion of pyruvate to glucose through a series of enzymatic reactions that take place in the cytoplasm, followed by the mitochondria and endoplasmic reticulum. This metabolic pathway is essential for the production of glucose in the body when dietary carbohydrates are not available, and the liver is capable of producing glucose from non-carbohydrate substances. Understanding the order of the location(s) for gluconeogenesis in a liver cell is essential for understanding how this process occurs and is an important part of the study of metabolism.
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From your General Cell Biology, which substrate binds to the Rab-Ran-Ras-Rac-Cdc42-Rho family of proteins that is crucial for the activation of that enzyme? a. GTP.
b. ATP. c. GDP.
d. ADP.
The substrate that binds to the Rab-Ran-Ras-Rac-Cdc42-Rho family of proteins and is crucial for their activation is GTP.
Option (a) is correct.
The Rab-Ran-Ras-Rac-Cdc42-Rho family of proteins are small GTPases that play important roles in cellular signaling and regulation. These proteins undergo a cycle of activation and inactivation by binding to either GTP (guanosine triphosphate) or GDP (guanosine diphosphate).
The active form of these proteins, which allows them to carry out their functions in signaling pathways, is when they are bound to GTP. When GTP is bound, the GTPase is in the "on" or active state. On the other hand, when GDP is bound, the GTPase is in the "off" or inactive state.
The exchange of GDP for GTP and the subsequent hydrolysis of GTP to GDP is regulated by specific guanine nucleotide exchange factors (GEFs) and GTPase-activating proteins (GAPs), respectively.
To activate the Rab-Ran-Ras-Rac-Cdc42-Rho family of proteins, GTP must bind to these proteins, leading to a conformational change that allows them to interact with downstream effectors and initiate signaling cascades.
Therefore, the correct option is (a) GTP.
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