Major events in the history of life on Earth include the emergence of prokaryotes, photosynthesis, the origin of eukaryotes, and the colonization of land by plants and fungus.
What initial indications of life did the Earth show?The fact that the earliest indications of life on Earth are so basic makes sense. Earth's first fossilized life can be found 3.7 billion years ago. In old rock samples from Greenland, they were discovered to be well-preserved.
What are some of the first signs of life on Earth?Stromatolite fossils and biogenic carbon fingerprints found in metasedimentary rocks from western Greenland that are 3.7 billion years old are the earliest signs of life. In Western Australia, 4.1 billion years old rocks that may have had "remains of biotic life" were discovered in 2015.
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A zygote having 2n-1 chromosomes
Monosomic
Having the appropriate number of chromosomes
Euploidy
Having an abnormal number of a particular chromosome
Aneuploidy
Having three complete chromosomal sets in all somatic cells
Triploidy
A zygote having 2n+1 chromosomes
NOT A MATCH
A zygote having 2n-1 chromosomes is Monosomic.
Each species has a unique number of chromosomes, like the 46 chromosomes that make up a typical human cell. This number is referred to as 2n in organisms with two sets of full chromosomes, such as humans.
Aneuploid means "not good" and refers to a cell lacking one or more chromosomes. Aneuploid cells, for instance, are human somatic cells that have chromosome numbers of (2n - 1)=4 or (2n + 1) = 47.
An organism has monosomy when it only has one copy of a chromosome that should have two copies, which means it has a ploidy number (2n-1).
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which statement is false? a) a carrot is an example of a taproot. b) white potatoes are modified plant roots. c) stalks of celery are the petioles of the plant. d) the layers of an onion are actually modified leaves.
Answer:
Option B
Explanation:
A plant basically consists of a root, stem and leaves. However, these structures can undergo modifications and form some foods that we know.
Analyzing the alternatives, we can analyze that:
a) is correct because the carrot really is the taproot and there are smaller roots that start from the taproot.b) is incorrect because white potatoes are modified stems (tubers) and not roots.c) is correct because celery stalks are the stalk of the leaf and are called the petiole.d) is correct because the layers of the onion are actually composed of modified leaves.Therefore, the answer is option "B".
the following molecules are involved in the biosynthetic pathway that leads to the formation of dna and rna. what is their correct sequence in this pathway? a. para-aminobenzoic acid (paba) b. tetrahydrofolic acid (thf) c. purine and pyrimidine nucleotides d. dihydrofolic acid
PABA, dihydrofolic acid, THF, purine and pyrimidine nucleotides are r correct sequence in this pathway which are involved in the biosynthetic pathway that leads to the formation of dna and rna.
The biosynthetic pathways of natural antimicrobial compounds in plants appear complex and diverse, but they are systemic. Tetrahydrofolates (THF)2 are a type of cofactor that transports and activates one-carbons for the synthesis of purines and thymidylate, as well as the remethylation of homocysteine to methionine. PABA (para-aminobenzoic acid) is a naturally occurring substance. It is frequently found in sunscreen products. PABA is also known as vitamin Bx, but it is not a true vitamin. This article discusses PABA reactions such as overdose and allergic reaction.
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Asexual reproduction produces genetically identical individuals becauseit involves chromosome replication without cytokinesiscell division occurs only in meiosisno meiosis or fertilization take placechromosomes do not have to replicate during asexual reproduction2 pointsWhich of the following is not an accessory pigment for photosynthesis?chlorophyll bcarotenoidsbeta-carotenechlorophyll a2 pointsQUESTION 20If the haploid number of chromosomes in an organism is 16, then the diploid number is432824
Asexual reproduction produces genetically identical individuals because either no meiosis or fertilization takes place. Chlorophyll-a is not an accessory pigment for photosynthesis.
So, the correct options are C &D.
The diploid number is 32 if the haploid number of chromosomes in an organism is given to be 16. Gametes like sperm and eggs are typically haploid cells, whereas somatic cells and the zygote have a diploid number. The organism will have exactly 32 diploid chromosomes if its haploid chromosome count is 16, which is exactly double the haploid count.
Children born through asexual reproduction have a single parent's genetic makeup as their parents. The genetic makeup of each child is unique thanks to the genetic contributions of both parents in sexual reproduction. Due to the benefits and drawbacks of both sexual and asexual reproduction, some organisms engage in both types of reproduction.
There are several pigments found in a chloroplast, including chlorophyll a, chlorophyll b, carotene, and xanthophyll. The only one of these that can directly take part in photosynthesis is chlorophyll a. Chlorophyll receives the light energy that all other pigments absorb.
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A client who tells the nurse thatshe would like to use the basalbody temperature method forfamilyplanningreceivesinstructions about the method.Which of the following clientstatements indicates to the nursethat the teaching has beensuccessful?A. "When my temperature remainselevated for 7 days, ovulation hasoccurred."B. "Taking my temperature in theevening just after dinner or beforeI go to bed is best."C."Because this method is not veryeffective, I should use other formsof contraception too."D. "It's important to take mytemperature at about the sametimeeverymorningbeforearising."
The basal body temperature method, which is based on fertility awareness, is a type of natural family planning.Thus correct answer (d) "It's important to take my temperature at about the same time every morning before arising.
The client who is following the basal body temperature approach should take her temperature for 5 minutes every morning before arising or beginning any activity. This prevents other things from potentially impacting body temperature, such as eating or moving.
A graph should be used to record the temperature reading. A modest dip in body temperature happens in some women immediately before ovulation. However, a woman cannot know when ovulation will occur until it has occurred.
Ovulation usually happens when a minor dip in body temperature is followed by a full degree increase. This temperature spike lasts throughout the duration of the menstrual cycle.
Taking the basal body temperature at times other than when the client first wakes up, such as before sleep, may result in erroneous results since the client's temperature can be impacted by a variety of circumstances, creating variations.
If the client is motivated and capable of doing the operation appropriately, basal body temperature can be an effective fertility management strategy.
Unfortunately, it is one of the most untrustworthy approaches. For a number of reasons, customers who choose this procedure do not want to employ alternative chemical or barrier treatments.
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\make connections if you arrested a human cell in metaphase i of meiosis and applied this technique, what would you observe? how would this differ from what you would see in me
During metaphase one, the tetrads of the cell congregate just on metaphase plate. During a process known as meiosis, an one cell divides twice.
The centromeres on every chromosome are subsequently grasped by the spindle fibers, which then attach themselves onto them. The cell checks to see whether the chromosomes are in the proper place before moving on to the next stage of metaphase I, which would be positioned between the cell nucleus two opposing ends. During a process known as meiosis, an one cell divides twice. The metaphase, a single, fleeting step of the meiosis process, occurs twice: once throughout meiosis I and again during meiosis II. During the meiotic process, an one cell divides twice to create four haploid daughter cells. These cells are known as the gametes, as well as sperm & egg in men and females, respectively.
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DUE IN 30 MINUTES I NEED HELP RN!!!
1. Two things that are found in plant but not animal cells are chloroplast and cell wall
2. Plant cell is pentahedral while animal cells have no regular shape.
3. The chloroplast is the site of photosynthesis
4. The vacuole is a site for storing
Plant vs animal cellPlant cells are generally found in green plants while animal cells are found in animals. Both cells are eukaryotic in nature. However, they have some differences, including:
Plant cells have cell walls made mainly of polysaccharides while animal cells lack cell walls entirely.Due to the rigid cell wall, plant cells assume a unique rectangular shape while animals, due to the absence of cell walls, lack regular shapes.Plant cells have chloroplasts, a structure that contains chlorophyll and acts as the site of photosynthesis in plants. Animal cells do not have chloroplasts and neither do they photosynthesize.Both plant and animal cells have vacuoles. The vacuole in animal cells is small and helps to sequester waste products. The vacuole in plant cells, on the other hand, is big and helps the cell to maintain water balance.
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This figure summarizes the geological histories of the terrestrial worlds. Based on this figure, what can you conclude?
Based on this figure the most important factor in a planet's geological history is its size.
Terrestrial planets include Mercury, Venus, Earth, and Mars because of their compact, rocky surfaces that resemble terra firma on Earth. The four innermost planets in the solar system are the four terrestrial planets.
Impact cratering, volcanism, tectonic movement, and erosion are the four main geological processes. Earth has been hit by many objects, but the majority of the craters have been removed by other processes. Volcanic outgassing is responsible for the formation of our atmosphere and oceans.
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which processes are functions of antidiuretic hormone? select all that apply. one, some, or all responses may be correct.
A hormone that aids in blood vessel constriction and aids the kidneys in managing the body's salt and water levels.
What actions does antidiuretic hormone perform?a hormone that aids in blood vessel constriction and aids the kidneys in controlling the body's salt and water levels. This regulates both blood pressure and urine production.
What are the choose all that apply antidiuretic hormone's functions?Anti-diuretic hormone regulates the amount of water and subsequently the concentration of urine discharged by the kidney to maintain blood pressure, blood volume, and tissue water contentnti. Adiuretic hormone (ADH) stimulates water reabsorption as its main renal impact.
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griffith's experiments with s. pneumoniae were significant because they showed that traits could be transferred from one organism to another. what else did he find that was significant? griffith's experiments with s. pneumoniae were significant because they showed that traits could be transferred from one organism to another. what else did he find that was significant? a virus made the bacteria pathogenic protein could not be the genetic material dna was the genetic material heat kills bacteria the transferred traits were heritable
Griffith's experiments with s. pneumoniae were significant because they showed that traits could be transferred from one organism to another. he find that the transferred traits were heritable.
Griffith's experiments with S. pneumoniae were important because they showed that traits can be transmitted from one organism to another and that these transmitted traits are known as heritable traits. did. Another experiment conducted by Hershey and Chase confirmed that DNA is actually genetic material, not protein.
Hershey and Chase were able to separate the phage into radioactive sulfur-containing protein ghosts and radioactive phosphorus-containing DNA. They found that radioactive sulfur protein ghosts can stick to bacterial membranes, but radioactive phosphorous DNA cannot.
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in the accompanying image, a nucleotide is indicated by the letter . double-stranded dna contains definite elements marked from a to d. letter a marks a full turn of dna. letter b marks a chemical compound, which is a structural element of dna. letter c marks two chains of dna and the bonds between them. letter d marks one chain of the dna. in the accompanying image, a nucleotide is indicated by the letter . double-stranded dna contains definite elements marked from a to d. letter a marks a full turn of dna. letter b marks a chemical compound, which is a structural element of dna. letter c marks two chains of dna and the bonds between them. letter d marks one chain of the dna. a c d b
Answer is B, The letter B in the accompanying graphic stands for a nucleotide, nitrogenous base phosphate. DNA different nitrogenous bases. Nucleotides are needed for the execution of physiological and metabolic activities.
Building blocks of nucleic acids, energy storage, transporters of activated metabolites for biosynthesis, DNA structural moieties of coenzymes, and metabolic regulators are all roles that nucleotides play in the physiology DNA of animals. A nucleotide is a chemical molecule made composed of a nucleoside and a phosphate.
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although goats and sheep appear similar and can be mated (gametes fuse), their offspring are rarely born alive. this is an example of .
This is an example of chromosomal mismatch.
What is chromosomal?
Each cell's nucleus contains chromosomes, which are structures that resemble threads and contain the DNA molecule. Each chromosome is constructed from DNA that has been tightly wound around proteins called histones numerous times to support its structure.
When a cell is not dividing, chromosomes cannot be seen in the nucleus, not under a microscope. However, during cell division, the DNA that makes up chromosomes gets more compactly packed and becomes visible under a microscope. The majority of what scientists understand about chromosomes comes from studying them during cell division.
There is a huge difference between the goats and sheep's genetic maps.
sheep comes from the genus Ovis and consist 54 chromosome ,whereas goats comes from genus capra and consists 60 chromosomes .
Hence, due to chromosomal mismatch their offspring are rarely born alive.
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Why does it make sense that acetyl-coa stimulates the activity of pyuruvate carboxylase?.
Acetyl-CoA indicates that the conversion of fat to carbs is necessary. Acetyl-CoA carboxylase accumulation indicates a lack of citrate. NADH is produced for energy when pyruvate carboxylase is activated by acetyl-CoA.
Why is it logical that acetyl-CoA would cause pyruvate carboxylase to be activated?Acetyl-CoA selectively activates pyruvate carboxylase. When acetyl-CoA concentrations are high, organisms use pyruvate carboxylase to divert pyruvate from the TCA cycle because acetyl-CoA is a crucial metabolite in the TCA cycle that generates a lot of energy.
How does pyruvate carboxylase become activated by acetyl-CoA?The production of more oxaloacetate is triggered by an excess of mitochondrial acetyl-CoA. When lipolysis is induced, for instance, intramitochondrial acetyl-CoA levels rise, allosterically activating pyruvate carboxylase to produce more oxaloacetate for gluconeogenesis.
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trans-acting regulators of gene expression include? trans-acting regulators of gene expression include? histone deacetylases the tata box promoters silencers introns
Trans-acting regulators of gene expression include histone deacetylases. Correct answer: letter E.
This is because they can influence chromatin structure and subsequently control gene expression. By removing acetyl groups from histone lysine residues, HDACs can cause neighboring histones to bind more tightly, which compacts chromatin and makes it more difficult for transcription factors to access DNA. As a result, gene expression is reduced.
What are trans-acting regulators of gene expression?Are molecular components that interact with DNA to control the production of proteins. These regulators act on the transcription level, where DNA is transcribed into mRNA, allowing the expression of the gene in question. Examples of trans-acting regulators of gene expression include:
The tata boxSilencersPromotersHistone deacetylasesIntronsLearn more about trans-acting regulators of gene expression:
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controversial solution used to stop the sporadic typhoid fever outbreaks attributed to ""typhoid mary""- was incarceration justifiable?
Mary Mallon, also referred to as Typhoid Mary, was an American chef of Irish descent who is thought to have exposed between 51 and 122 persons to typhoid fever. With estimations of up to 50 for unconfirmed mortality, the illnesses resulted in three verified fatalities. She was the initial American to be recognized as a carrier of the virulent strain of Salmonella typhi. She continued to work as a cook, exposing others to the illness. She eventually spent the last two decades of her life in a quarantine that was imposed upon her twice by the authorities. After spending close to 30 years in isolation, Mallon passed away.
What is typhoid?
Salmonella Typhi is a bacteria that can cause the potentially fatal infection typhoid fever. Typically, contaminated food or water is how it is disseminated. Typhoid affects an estimated 11 to 20 million people, and between 128 000 and 161 000 people die from it each year.
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which stage of shock is best described as that stage when the mechanisms that regulate blood pressure fail to sustain a systolic pressure above 90 mm hg?
Answer:
Explanation:
In humans, brown eyes (B) are dominant over blue (b) : A brown-eyed man marries a blue- eyed woman and they have three children; two of whom are brown-eyed and one of whom is blue-eyed: (in this case do capitalize the appropriate letters to show the difference between dominant and recessive) If blue is recessive, what must the woman's genotype be? If that's her genotype; what kind(s) of gametes (eggs) can she produce? Ifthe man has brown eyes. but has blue_ eyed child what must his genotype be? If that's his genotype what kind(s) of gametes (sperm) can he produce? and What are the possible genotypes of the children? and
The woman's genotype is bb. The gametes which she can produce is Bb. Men's genotype is Bb. Gametes produce by men is Bb. Children genotypes are Bb, Bb, bb for three children.
The gene required here is that coding for eye variety in people. The allele for earthy colored eyes (B) is prevailing over that of blue eyes (b) for example earthy colored eyes allele (B) will cover the articulation blue eyes allele (b) in a heterozygous state.
A brown-looked at man is crossed with a blue-peered toward lady (bb). The lady will be homozygous passive since the latent quality must be communicated in a homologous state. They produce 2 brown-peered toward offsprings and 1 blue-looked at posterity.
Note that, for the one who have the prevailing characteristic (earthy colored eyes), he can either have a homozygous or heterozygous genotype. Since he created a latent phenotyped (blue eyes) posterity when crossed with a blue-looked at lady, it implies he gave a passive allele (b) which joined with that of the lady. Thus, the man has a heterozygous genotype (Bb).
Having known the man's genotype, a cross (see connected picture) among Bb and bb will create four potential children; 2 will be heterozygous brown-looked at (Bb) while the other two will be homozygous blue-peered toward (bb).
Since two of their kids were brown-peered toward, they will have a (Bb) genotype while the blue-looked at kid will have a (bb) genotype.
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What is a real-world example of an open population?
The real-life example of an open population is when people from one country can migrate to another country for different purposes. This is an example of an open population.
What are the open and closed populations?Individuals can move from one population to another in an open population, such as when people migrate from one country to another. The open population is affected by births, deaths, migration, and other factors. The gene pool is different because many types of individuals are living, but in a closed population, there is no migration inside or outside the population, and the population depends on births and deaths.
Hence, the real-life example of an open population is when people from one country can migrate to another country for different purposes.
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An ideal gas contained in a piston-cylinder device undergoes an isothermal compression.
Thermodynamics. With an initial pressure of 110 kPa and a volume of 0.7 m3, an ideal gas is compressed isothermally inside of a piston-cylinder system.
What is an ideal gas, exactly?The term "ideal gas" refers to a hypothetical gas comprised of molecules that meet the following rules: The molecules of perfect gases are not attracted to one another or repel one another. When molecules of an ideal gas encounter, the only interaction would be an elastic collision, or an elastic collision with the container walls.
What sets optimum gas apart from flawless gas?According to physicists, a perfect gas is one that satisfies the ideal gas law and possesses a temperature-independent heat capacity. It is referred to as an ideal gas since it is perfect. Engineers utilize it because it follows the ideal gas law and has a heat capacity that varies with temperature.
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Which type of noncovalent interaction supports the double helix of dna and produces the base pairings a–t and g–c?.
The type of non-covalent interaction between the base pairing of a double helix of a DNA molecule is hydrogen bonding.
The two different types of nucleic acids are as follows:
Deoxyribonucleic acid (DNA)
Ribonucleic acid (RNA)
The bases of RNA and DNA molecules are coupled together. The bases of DNA molecules are guanine, adenine, cytosine, and thymine, while the bases in RNA molecules are adenine, uracil, guanine, and cytosine.
In a DNA molecule, A and T are always connected, whereas G and C are coupled and base T is converted to base U in RNA. A base pair's weak hydrogen bond with the DNA molecule's double helix can be easily disrupted.
The complete question is:
Which type of noncovalent interaction supports the double helix of DNA, and produces the base pairings A-T and G-C?
a. ion-dipole interactions
b. dipole-dipole forces
c. ion-ion interactions
d. London dispersion forces
e. hydrogen bonding
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chegg which type of mutation is most likely to cause a change in a protein's structure and function (frameshift, missense, nonsense, and or silent mutations)? what is least likely to change the protein's structure and function? explain.
The likelihood that silent mutations will alter protein function is low. It can be challenging to forecast missense mutations. The mutant protein might still work if the alteration is to a non-critical amino acid or to an amino acid that is comparable.
Which of the following changes to the protein's structure and function is least likely to occur?An exchange of one nucleotide for another in the DNA sequence results in a substitution mutation. Only one amino acid at most would change in the protein because this wouldn't move the gene sequence ahead or backward.
Which protein structure suffers the least from denaturation?Covalent peptides, which are preserved via denaturation, are responsible for maintaining primary structure.
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10. The cell wall... *
OIs where photosynthesis happens
OIs where cellular respiration happens
OIs found in plant cells but not animal cells
O Produces energy
on land, the most diverse and productive ecosystems are the even though they only represent about % of the earth's surface.
The world's tropical woods contain some of the planet's most diversified ecosystems. They are home to millions of species that are well-known as well as millions more that have yet to be found.
Why do diversified ecosystems produce higher output?By raising the potential that different species may use complementary resources, increasing species diversity can have an impact on ecosystem functions like productivity. It can also raise the chances that a species that is highly productive or efficient is present in the community.
What factors cause ecosystem diversity?In general, the physical features of the ecosystem, the variety of species present, and the interactions between the species and their surroundings all affect how diverse an ecosystem.
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in a study to evaluate a test as a screen for the presence of a disease, 235 of the 250 people with the disease had a positive test and 600 of the 680 people without the disease had a negative test. based on this data, the specificity of the test for the disease is (check one)
The Correct option are C. 600/680 = 88%. The specificity of a test for a disease is the proportion or percentage of those without the disease who have a negative test.
Option A in this situation is the sensitivity, or the proportion of people with the condition who have a positive test.
Option B represents the false-negative rate, whereas
Option D represents the false-positive rate.
Option E is a nonsensical ratio of false-negative tests to false-positive tests.
The predictive values of positive and negative tests are critical features of a screening test. Determining these values necessitates information about the disease's prevalence in the screened population, as well as the sensitivity, specificity, and false-positive and false-negative rates.
Because most illnesses have a low prevalence, the percentage of people who have a positive test (the predictive value of a positive test) is generally low, even when sensitivity and specificity are high. When
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Full Question :In a study to evaluate a test as a screen for the presence of a disease, 235 of the 250 people with the disease had a positive test and 600 of the 680 people without the disease had a negative test. Based on this data, the specificity of the test for the disease is (check one)
A. 235/250 = 94%
B. 15/250 = 6%
C. 600/680 = 88%
D. 80/680 = 12%
E. 15/80 = 19%
if a person was told that organism a and organism b were involved in a mutualism-type relationship, but knew nothing about these two organisms, what could this person say?
If someone who didn't know anything about organisms a and b was informed that they were engaged in a mutualistic relationship, both must be benefited.
When two organisms of different species "operate together," they are said to be in a mutualistic relationship since they both gain from it. An illustration of a mutualistic connection is the one between an animal called an oxpecker and a rhinoceros or zebra. 11 terms were just studied by you. A organism resides inside a sea mutualistic , where it receives protection and serves as a lure to draw in other fish for the anemone to sting and consume.
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What is one explanation for why Lashley failed at finding the engram?
a. He used poor surgical methods.
b. Some memories do not depend on the cortex.
c. The engram is continually changing location in the cortex.
d. Classical conditioning had not been discovered yet.
The explanation for the failing of Lashley at finding the engram as some memories do not depend on the cortex. The correct option is b.
What is engram?An engram, as defined by Dianetics and Scientology, is a detailed mental image or memory of a traumatic event that occurred in the past while an individual was partially or completely unconscious.
A memory trace is an engram in neuropsychological terms, which is a hypothetical means of storing information as biophysical or biochemical changes in the brain (and other neural tissue) in response to external stimuli.
Lashley's failure to find the engram is explained by the fact that some memories do not rely on the cortex.
Thus, the correct option is b.
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cancer is best described as a . view available hint(s)for part a cancer is best described as a . viral disease genetic disorder at the cellular level bacterial disease at the somatic cell level genetic disease at the gametic cell level
The option B is correct : Genetic disorder at the cellular level Cancer is a condition in which some cells in the body develop uncontrolled and spread to other regions of the body.
Cancer may develop practically anyplace in the human body, which contains billions of cells. Genes are the genetic building blocks. They are passed down from generation to generation.
They contain DNA, which contains the instructions for producing proteins. Proteins perform the majority of the work in cells. They transport molecules, construct structures, degrade poisons, and perform a variety of other maintenance tasks. A mutation, or alteration in a gene or genes, occurs from time to time.
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Full Question
Cancer is best described as a ________.
a. bacterial disease at the somatic cell level
b. genetic disorder at the cellular level
c. genetic disease at the gametic cell level
d. viral disease
Hirsutism is a condition that is characterized by __________.
a. a decrease in androgen production
b. hair thinning
c. graying of the hair
d. excessive hairiness
e. hair loss
what type of protein is lacking on a blood cells membrane that enables the blood to be used as a universal donor? g
Antigen protein is a type of protein that is missing on the membrane of a blood cell, allowing the blood to be used as a universal donor.
An Antigen protein is some kind of flag — like a protein or series of amino acids — that your invulnerable system can acknowledge. If this description appears a little fuzzy to you, you're more than one. Let's dig in further. Antigen proteins are usually proteins or sugars (polysaccharides) that establish the except for belongings like cells or viruses.
Polypeptides, lipids, basic acids, and many additional materials can again function as antigens. People with type O- ancestry are named universal donors cause their granted red ancestry containers have no A, B, or Rh antigens and can then be safely likely to the nation of some blood group.
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Which of the images represents mitosis and why?
Following the end of the G2 phase of interphase, the first step of mitosis is known as prophase. The parent cell's chromosomes, which were duplicated during S phase, condense and became much smaller than they did during interphase during prophase. The two identical sister chromatids that make up each duplicated chromosome are connected at a location known as the centromere, giving these structures the appearance of being X-shaped bodies when seen under a microscope. Cohesin and condensin are two DNA-binding proteins that catalyze the condensation reaction. Condensin generates rings that coil the chromosomes into extremely compact shapes, whereas cohesin forms rings that keep the sister chromatids together.