In a longterm structural MRI study of bipolar disorder, Abé et al. find that individuals who have manic episodes have less frontal brain volume than patients who remain stable.
The findings imply that the presence of mania contributes to frontal grey matter loss in bipolar disorder.
The amygdala, hippocampus, and dorsomedial thalamus are the primary subcortical limbic brain areas associated with depression. Depression has been associated with both structural and functional abnormalities in these regions.
Hippocampal volumes have been found to be smaller in depressed people (10, 25). It is generally accepted that bipolar disorder is caused by chemical imbalances in the brain. Neurotransmitters, such as noradrenaline, serotonin, and dopamine, are the substances in charge of regulating how the brain works.
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Which proteins lends structural support to the chromosome and helps activate or silence gene expression?.
The chromosomes are structurally supported by histone proteins, which also aid in the packaging of DNA.
Which proteins help to activate or suppress gene expression and provide structural support for the chromosome.In the cell nucleus, histones serve as structural proteins. Histones are encircled by DNA, which gives chromosomes their structure. Histones can change by having chemical groups like methyl or acetyl groups added to them or removed from them (each consisting of two carbon, three hydrogen, and one oxygen atoms).
What protein helps a chromosome maintain its structural integrity?A chromosome's structural support is provided by a protein called a histone. Long DNA molecules found on each chromosome must fit into the cell nucleus. This is accomplished by the DNA wrapping around histone protein complexes, giving the chromosome a more compact form.
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: suppose an individual carried a dominant inherited mutation that prevented the normal successful development of myeloid stem cells. which type of blood cells would most likely be absent from this individual?
If a mutation prevents the successful development of myeloid cells then erythrocytes, monocytes, macrophages, neutrophils, basophils, eosinophils, and platelets will be absent in a person.
Hematopoiesis is a process in which all mature blood cells are formed. In vertebrates (including humans) this process usually takes place in the bone marrow. All blood cells are developed from hematopoietic stem cells. These cells give rise to two different cell lines myeloid and lymphoid.
Myeloid cell lines give rise to erythrocytes, monocytes, macrophages, neutrophils, basophils, eosinophils, and platelets. Hence the absence of myeloid cells prevents the development of the cells mentioned above. Lymphoid cell lines give rise to T-cells, B-cell, and natural killer cells.
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true or false?: chemicals that block the assembly of microtubules or microfilaments would cause little effect on the cell?
Answer:False
Explanation:
false, Chemicals that prevent microtubules or microfilaments from forming would have little impact on a cell.
Microfilaments, also known as actin filaments, are protein filaments that make up the cytoskeleton in the cytoplasm of eukaryotic cells. They are primarily made of actin polymers, but many other proteins in the cell also modify and interact with them. Two strands of actin make up microfilaments, which are typically 7 nm in diameter. Cell motility, shape alterations, endocytosis and exocytosis, cell contractility, mechanical stability, and cytokinesis are some of the functions of microfilaments. Microfilaments may withstand compressive stresses of up to a few piconewtons without buckling or tensile forces of a few nano-newtons without breaking. Actin filaments, most likely driven by myosin II molecular motors, lengthen at one end while contracting at the other to cause cell movement.
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if the atmosphere is about 80% nitrogen and therefore constantly in contact with the oceans, how can parts of the ocean be nitrogen limited? how do organisms eventually get to use it?
In order for phytoplankton to use it, it must be nitrogen-fixedated by cyanobacteria where it's turned into nitrates- phytoplankton use the broken down nitrates.
Phytoplankton uses nitrate for what purposes?The presence or absence of nutrients in the water, like phosphate and nitrate, affects the amount of phytoplankton in the water.Phosphorus and nitrate, which are markers of the quality and quantity of water fertility, are crucial for the growth & metabolism of phytoplankton, according to .
How is phytoplankton impacted by nitrate?So because high levels of nitrate are consumed by low levels of phytoplankton, a concentration of nitrate drops correspondingly as the bloom develops.
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Choose from the following statements the ones that correctly discuss reproduction using binary fission In bacterial Select all that apply: Hints Each daughter cell will contain an equa number of organelles: The daughter cell will be permanently smaller copy of the mother cell but will contain complete genome. Each daughter cell is an exact copy of the other; both genetically and morphologically: Due to the stretching of the cytoplasmic merbrane, both cells will contain complete genome
Bacteria binary fission : Due to the stretching of the cytoplasmic membrane, both cells will contain a complete genome. Each daughter cell is an exact copy of the other, both genetically and morphologically.
Bacteria divide through a mechanism known as binary fission. The chromosome duplicates itself during binary fission, creating two genetically identical copies. The cell then grows and splits into two new daughter cells. The parent cell and its two daughters are identical. Binary fission in bacteria resembles human and other eukaryotic organisms' mitosis in certain aspects. In both situations, the cell splits its cytoplasm into two new cells while copying and separating the chromosomes. Binary fission is the mechanism by which bacteria and archaea reproduce asexually by dividing a single cell into two equally sized pieces. To ensure that each daughter cell receives a copy of the DNA instruction handbook, a cell must duplicate the genome before it divides.
The complete question is:
Choose from the following statements the ones that correctly discuss reproduction using binary fission in a bacterial cell.
Select all that apply.
-The daughter cell will be a permanently smaller copy of the mother cell but will contain a complete genome.
-Due to the stretching of the cytoplasmic membrane, both cells will contain a complete genome.
-Each daughter cell is an exact copy of the other, both genetically and morphologically.
-Each daughter cell will contain an equal number of organelles.
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Imagine you want to identify some organisms in a local pond that you often visit. What key features about such organisms might you find in a dichotomous key? check all that apply.
The distinguishing characteristics of an organism that could appear in a dichotomous key are:
A. if it is mobile (is able to move)
C. If it has cilia
D. If it's green,
Using a dichotomous key, groupings of organisms are regularly split into two categories as a means of identification. More specific information about an organism's unique characteristics is disclosed with each successive division. The organism has been identified when it can no longer be distinguished from any other creature by the entirety of its chosen traits. It is ideal to employ immutable qualities, or characteristics that never change, when using a dichotomous key to identify specimens. However, size, coloration, and behavioural traits can all vary among individuals.
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use may stimulate epinephrine release and lead to an increase in the rate of muscle and liver glycogen breakdown, the release of free fatty acids from adipose tissue, and the use of muscle triglycerides.
Caffeine use may stimulate epinephrine release and lead to an increase in the rate of muscle and liver glycogen breakdown, the release of free fatty acids from adipose tissue, and the use of muscle triglycerides.
Because caffeine is a stimulant, it makes your brain and nervous system more active. Additionally, it promotes the body's circulation of hormones like cortisol and adrenaline. Caffeine can help you feel alert and concentrated in modest quantities.
There are many ways that caffeine affects the heart. First of all, it encourages noradrenaline and norepinephrine secretion. These hormones, among other things, raise blood pressure and heart rate. Caffeine can also affect the enzymes that cause the heart to contract more forcefully by stimulating those enzymes.
Such high caffeine intake might result in major health issues and even death. Caffeine usage is not recommended for kids, even though it may be safe for adults. It's important to warn teenagers and young adults against consuming too much caffeine and combining it with alcohol and other drugs.
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Biologists divide the biosphere into ______, which are the major types of ecosystems on earth.
The biosphere is divided into biomes by biologists.
What criteria are used to categorize biomes?An place is categorized as a biome based on the species that call it home. Scientists can define a biome by defining the temperature range, soil type, amount of light, and water that are peculiar to a location and create niches for particular species.
What are the two primary categories for biomes?Deserts, woods, grasslands, savannas, tundra, and freshwater ecosystems are examples of biomes that fall under the categories of terrestrial and aquatic, respectively. Based on their overall environments, ecosystems can be divided into three basic categories: freshwater, marine, and terrestrial.
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a fruit fly (drosophila) has n=4 chromosomes. how many chromosomes should be in a sperm cell from a male fruit fly?
which of the following occurred by active transport? a. albumin in the urine b. re-absorption of amino acids c. re-absorption of water at the proximal tubule d. creatinine in the urine
The correct answer is b) re-absorption of amino acids occurred by active transport.
The portion of renal physiology known as renal protein reabsorption is responsible for retrieving filtered proteins and preventing their excretion through the urine. Because amino acid transporter molecules are present, amino acids are absorbed in the proximal convoluted tubule (PCT) of the renal tubule of a nephron. In the proximal tubule, reabsorption occurs almost exclusively. In the final urine, there is only 1% left. Through endocytosis, the proteins pass through the apical membrane. They are then broken down into lysosomes. Amino acid transporters move the remaining free amino acids through the basolateral membrane.
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3. what did you discover about the genetics of the parents and the wife's sister when you ran your gels?
Through their genes, parents transmit traits and characteristics to their offspring, such as eye color and blood type. Some illnesses and medical conditions can also be genetically passed down. A trait can occasionally take on numerous forms. Blood types, for instance, can be A, B, AB, or O.
Understanding genetics is crucial for all life sciences academics because it plays a central role in contemporary biology. Numerous facets of daily life are greatly impacted by discipline. The food we eat and the clothing we wear come from organisms that have been enhanced through the use of genetic principles.
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are unipolar neurons in a tissue sample more likely to function as sensory neurons or motor neurons?
These neurons most likely serve as sensory neurons because the majority of PNS sensory neurons are unipolar.
Bipolar, multipolar, and unipolar neurons are the three different classes of nerve cells in animals' bodies that transmit information. Between the central nervous system (CNS) and the rest of the body, neurons communicate information using electrical impulses and chemical signals.
Scientists can identify the many types of neurons based on their structure and number of constituent parts.
The most prevalent type of neuron in the human nervous system, multipolar neurons have the greatest capacity for information transfer between cells.
In this article, unipolar, bipolar, and multipolar neurons are examined in further detail.
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How does the movement of water, carbon, and nitrogen in ecosystems differ from the movement of energy?.
Although matter is continually recycled and used, energy is transformed into heat as it moves through a community.
How does the flow of water in an ecosystem compare to the flow of energy?How does the flow of water in ecosystems compare to the flow of energy? Water moves continuously through ecosystems. One way energy moves is forward.
What distinguishes the flow of matter and energy in an ecosystem? Why?As soon as an organism dies and decomposes, all of these nutrients are released back into the abiotic environment, where they are then reintroduced into the biotic environment via the producers. Therefore, an ecosystem experiences cyclical flow of matter. The flow of energy, however, is always one way, from the sun to the producers to the consumers.
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which of the four model cells do you think will be best able to supply nutrients and water to its cell parts?
Answer:
. cell model A
Explanation:
The following table shows the surface area-to-volume ratio of four cube-shaped cell models.
Cell Model: A B C D
Surface Area: 6, 24, 54 ,96
Volume: 1, 8 ,27, 64
Ratio: 6:1=6 ,24:8=3, 54:27=2, 96:64=1.5
i hope i helped
a progressive decrease in the force of the urinary stream, dribbling of urine, and difficulty initiating the urinary stream are characteristic of?
A progressive decrease in the force of the urinary stream, dribbling of urine, and difficulty initiating the urinary stream are characteristics of benign prostatic hyperplasia (BPH).
The prostate will grow in size if you have benign prostatic hyperplasia (BPH). It is the most common problem with the prostate in men and people who were born male, and it gets worse with age for almost everyone. Side effects incorporate trouble peeing and an unexpected need to pee. Medication, surgery, and minimally invasive procedures are all forms of treatment.
Additional signs include:
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what determines the difference in speed of contraction of the different types of skeletal muscle cells?
Muscle fibres can be categorised into two types, Type II, which is rapid, and Type I, which is slow. In type II, there are three main fibre types, which are further broken down into type IIA called oxidative and type IIX (glycolytic).
What kinds of cells are found in skeletal muscle?
Myocytes, or muscle cells, are the cells that make up muscular tissue.
The three types of muscle cells found in the human body are cardiac, skeletal oxidative , and smooth.
How many different cell kinds are there?
There are about 200 different types of cells in your body.
These cells support the development of your immune system, which works to defend your body, as well as your tissues and organs.
The dead cells in your body are regularly replaced by fresh ones.
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there is good evidence that the internal circadian clock is located in the a. raphé nuclei. b. optic nerves. c. suprachiasmatic nuclei. d. caudal reticular formation e. basal forebrain.
A biological clock, also known as an overall coordinator, which regulates circadian rhythms is housed in the suprachiasmatic nucleus, a small group of cells in the hypothalamus (SCN).
The anterior region of the hypothalamus has a bilateral structure called the suprachiasmatic nucleus (SCN). It controls the majority of the body's circadian rhythms and serves as the circadian timing system's main pacemaker. The thalamus quiets down during the majority of the stages of sleep, allowing you to block out the outside world. However, the thalamus is active during REM sleep, sending the cortex pictures, noises, and other sensations that make up our dreams. Homeostatic sleep components including adenosine, nitric oxide, and GABAergic neurons in the preoptic portion of the hypothalamus suppress wake-promoting systems to produce sleep.
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a new strand of dna is made. write the name of the process and the main enzyme involved. process is called : enzyme that adds new nucleotides is called:
A new strand of DNA is made. The name of the process and the main enzyme involved is given below.
The process is called DNA replication.
Enzyme that adds new nucleotides is called DNA polymerase.
What is DNA replication?
The biological process of creating two identical copies of DNA from a single original DNA molecule is known as DNA replication. All living things replicate their DNA, which is the primary mechanism for biological heredity. This is necessary for cell division during tissue growth and repair, and it also ensures that each new cell gets a copy of the DNA. DNA replication is necessary because the cell's ability to divide makes it distinctive from other organisms.
The family of enzymes that catalyse the synthesis of DNA molecules from nucleoside triphosphates, the basic building blocks of DNA, includes DNA polymerase. These enzymes, which are required for DNA replication, typically function in groups to divide an initial DNA duplex into two identical copies.
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for each scientific name, indicate what is wrong and then correct it to the appropriate format. a few rules to remember. the genus is capitalized the species is lower case. when a scientific name is typed it must be put in italics. when it is handwritten it must be underlined. when abbreviating the scientific name you must include additional characteristics of the genus name when you have species with a genus name that begins with the same character. for example chinchilla chinchilla and chiropotes chiropotes would be abbreviated chinchilla and ch. chiropotes.'
Scientific Name
What’s Wrong
Correct Format
Homo Sapiens
Pan paniscus
Pan troglydtes
Italics are always used with scientific names. You can choose to underline Taxon instead while writing text by hand, but there is no justification for not italicizing text when using a word processor.
Use Bos taurus, not Bos taurus, as an example for scientific name. Humans (Homo sapiens) walk erect. People enjoy music. A taxon is not capitalized or italics if it is used more often, such as Hominidae to "hominid". Taxon should be used alone. According to the binomial nomenclature system, a scientific name is composed of two names. The first name of scientific name, sometimes referred to as the genus name, is capitalized and italicized. The second name is also italicized but not capitalized and is referred to as the species name (species name).
Homo Sapiens - Write species name in small letters - Homo sapiensPan paniscus - Put in italics - Pan paniscusPan troglydtes - Put in italics - Pan troglodytesLearn more about scientific name
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4) what do animals as diverse as corals and monkeys have in common? a) body cavity between body wall and digestive system b) number of embryonic tissue layers c) type of body symmetry d) presence of hox genes e) degree of cephalization
Animals as diverse as corals and monkeys have d) presence of Hox genes in common.
Structure of the HOX gene/protein and mutations found in limb malformation HOX genes are made up of two exons and one intron. Exon 2 contains a 180-nucleotide sequence known as the homeobox, which encodes a 60-amino acid helix-turn-helix motif with DNA-binding activity known as the homeodomain.
Hox genes control embryonic development in all animals, including humans, flies, and worms. They choose which body parts go where. Not surprisingly, if these genes fail, the consequences can be disastrous.
Hox genes are a subset of homeobox genes that specify regions of an embryo's body plan along the head-tail axis of animals. Hox proteins encode and specify 'position' characteristics, ensuring that the correct structures form in the correct places on the body.
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in the presence of penicillin, a cell dies because in the presence of penicillin, a cell dies because it lacks a cell membrane. it lacks a cell wall. its contents leak out. it undergoes lysis. it plasmolyzes.
In the presence of penicillin, cells die due because it undergoes lysis.
Penicillin is a group of antibiotics characterized by the presence of a β-lactam ring and is produced by some fungi (eukaryotes) to treat bacterial infections.
Penicillin inhibits cell wall formation by preventing the incorporation of acetylmuramic acid, which is formed in cells, and normally gives the bacterial cell wall a rigid shape. Without a cell wall, bacterial cells are vulnerable to outside water and molecular pressure, which causes the cell to die quickly or lyisis.
The type of cell wall destroyed by penicillin interferes with the synthesis of peptidoglycan (PG), which is the main ingredient in bacterial cell walls.
this question is a matter of choice:
it lacks a cell wall.
it plasmolyzes.
its contents leak out.
it undergoes lysis.
it lacks a cell membrane.
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in mouse embryonic stem cell transformations, the initial attempts to knockout functional target genes or replace defective genes with functional genes were not successful. to improve these technologies, researchers devised a double-selection strategy to select for homologous recombination into the target gene and select against random integration somewhere else in the genome. outline the double-selection strategy, the possible recombination events and which recombinant cells would survive in the presence of the two selecting agents.
First-generation embryonic stem cell isolation (ESCs) For the generation of pluripotent stem cells, Gibco medium and reagents, such as Gibco Knockout Serum Replacement (KSR), have a solid reputation.
For both human and mouse embryonic stem cells, we offer a wide range of comprehensive culture, engineering, differentiation, and analysis capabilities.
The culture conditions for ESC research must be carefully monitored. For many years, Gibco media and tools have been at the forefront of research on embryonic stem cells.
Gibco products give culture with assurance, from Knockout Serum Replacement to Gibco Essential 8 Medium and cell therapy research media, improved passaging reagents and substrates.
The effects of each selective agent are explained together with the usage of the most popular selection marker genes on plant transformation.
According to their mechanism of action, these genes may be split into two categories: genes for positive selection and genes for negative selection. Also highlighted is the preservation of the marker gene flow after chloroplast transformation.
The recovery of marker-free transgenic plants using techniques like multi-auto-transformation (MAT), co-transformation, site-specific recombination, and intragenomic transgene displacement by transposable elements are also discussed.
The selecting gene and the desired genes may be physically distinct or connected together in the same DNA vector. When the genes are connected together, co-transformation occurs often (i.e., cells with both genes integrated into the genome), but when the genes are separated, it occurs less frequently (Arago et al., 1996).
Typically, the selective agents are applied early in the transformation process to choose transgenic cells (Sawahel, 1994).
The effect of non-transformed cells dying on transformed cells should have the least possible impact on the selective medium throughout the subsequent regeneration processes.
The expression of selection marker genes is often regulated by a constitutive promoter, such as the CaMV 35S promoter, the nopaline and octopine synthase promoter, the actin promoter, or the ubiquitin promoter. Sometimes a marker gene will exhibit an agronomic trait, such herbicide resistance.
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for which organic compounds must information be encoded in dna for green plants to synthesize the other three compounds?
The information must be encoded for the fat organic compounds.
Plants experience the process of forming the metabolism of small molecules such as starch, cellulose, protein, fat and fatty acids, into larger compounds gradually through the process of anabolism. This process requires external energy, such as the energy of sunlight. The process of anabolism in plants occurs in the process of photosynthesis.
Photosynthesis is the process by which plants make energy from glucose by converting simple molecules into complex molecules through sunlight. In the process of photosynthesis, green plants will encode information on organic fat compounds before synthesizing other compounds to produce energy from food.
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3. the same second messengers are used in many different cells, but the response to second messengers is different in each cell. how is this possible?
the same second messengers are used in many different cells, but the response to second messengers is different in each cell. Proteins produced by different cells include cell-surface receptors and signalling pathway components.
As a result, they react differently to different ligands, and the second messengers activate different pathways. Signal integration can also alter the outcome of signalling. Second messengers are intracellular signalling molecules that the cell releases in response to extracellular signalling molecules, which are the first messengers. Second messengers induce cellular physiological changes such as proliferation, differentiation, migration, survival, apoptosis, and depolarization.
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one molecule of atp provides 0.30 ev of energy when it is metabolized in a cell. what is the minimum number of atp molecules that must be consumed in the reactions that lead to the emission of one photon of 550 nm light? n
The minimum number of ATP molecules that must be consumed in the reactions that lead to the emission of one photon of 550 nm light is 7.53 ATP.
ATP is Adenosine tri-phosphate, a nucleotide that is made up of three main structures: the nitrogenous base, adenine; the sugar, ribose; and a three phosphate groups attached to sugar. The phosphate tail is the power source of ATP. Energy is produced when the bonds between the phosphate are broken during hydrolysis.
Since, one molecule of ATP provides 0.30 eV of energy.
And the energy of a photon of 550 nm light is 2.26 eV.
So, the minimum number of ATP used is [tex]\rm\dfrac{ 2.26 eV } {0.30 eV} = 7.53 ATP.[/tex]
Therefore, 7.53 ATP is the least number of ATP consumed .
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Do other planets have seasons? Why or why not?
Answer: No
Explanation: Other planets do not have seasons because their atmospheres are simply too different from each other. For example, Neptune is way to cold to have hot summers or fall. The reasoning for this is because the distance between the sun. Pluto is just a ball of metals and random things combined. The sun could never have seasons because its a big ball of gas all year around. The sun doe not move, the plants revolve around the sun.
how does the parasite, euhaplorchis californiensis, found in the carpinteria salt marsh infect it's snail host?
The marine parasite California hornsnail (Euhaplorchis californiensis), the first intermediate host, can be found in salt marshes and brackish water along the Californian coast.
The parasite, which is physically adapted to this way of life, lives on or inside the host and harms it while doing so. The term "parasitism" refers to this close interaction between species. Parasites are described as "predators that consume prey in units of less than one" by the entomologist E. O. Wilson. In addition to animals like hookworms, lice, mosquitoes, and vampire bats, parasites also include single-celled protozoans like those that cause malaria, sleeping sickness, and amoebic dysentery, fungi like honey fungus and ringworm agents, and plants like mistletoe, dodder, and broomrapes. The primary six methods used by parasites to take advantage of their animal hosts are parasitic castration, direct transmission (by contact), trophically transfer (by ingestion), vector transmission, parasitoidism, and micropredation. An important categorization axis is that endoparasites live inside the host's body whereas ectoparasites live on the host's surface. Although both predation and parasitism involve interactions between consumers and resources, parasitism differs from predation in that, with the exception of parasitoids.
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three layers of tissue are responsible for filtration at the glomerulus. the basal lamina (basement membrane) limits passage of:
At the glomerulus, filtration is carried out by three layers of tissue. Passage of produced elements and glucose is restricted by the basal lamina (basement membrane).
The biological degree of organization between cells and an entire organ is called tissue. An assembly of comparable cells and their extracellular matrix from the same origin that work together to perform a particular function is referred to as a tissue. The functional fusion of many tissues results in the formation of organs.
On top of which the epithelium rests is a layer of extracellular matrix secreted by the epithelial cells, known as the basal lamina. Although it actually make up a small component of the basement membrane, it is frequently referred to mistakenly as the basal lamina.
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A geneticist crossed pure breeding black mice with pure breeding brown mice. All the 992 mice in the f1 generation had black coats. When these mice were crossed, they yielded 961 black coated mice and 317 brown coated mice.
The 992 mice of the F1 generation were all covered in black fur. These mice produced 961 black-coated offspring and 317 brown-coated offspring when they were crossed.
How could you explain the proportion of brown- and black-coated mice in the F2 generation? Please check all that apply.The dominance of the black allele over the brown allele in the F2 generation accounts for the roughly three-to-one ratio of black to brown coated mice. In the F1 generation, the brown allele segregates with the black allele and completely vanishes.
What inference did Mendel make from the F1 offspring of this cross?He created monohybrid crosses between plants that had spherical seeds and those that had seeds that were wrinkled. What inference did Mendel make about this cross's F1 generation For round seeds, there is a dominant allele.
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which of the following gut structures are listed in the correct order that food would pass through them, from input to exit? a. pyloric sphincter, ileum, jejunum, transverse colon. b. pancreas, jejunum, ascending colon, sigmoid colon. c. ileum, duodenum, descending colon, ascending colon. d. duodenum, ileum, caecum, transverse colon.
The correct order that food passes through is duodenum, ileum, caecum, and transverse colon.
What is digestion?
In order to be absorbed into the watery blood plasma, large, insoluble food molecules must be broken down into smaller, water-soluble food molecules during digestion. These tiny molecules enter the bloodstream through the small intestine in some organisms. Based on how food is broken down, digestion, a type of catabolism, is sometimes separated into two processes: mechanical digestion and chemical digestion. When a huge food item is physically broken down into smaller bits so that digestive enzymes may reach them, this process is referred to as mechanical digestion. Mastication in the mouth and segmentation contractions in the small intestine are two examples of mechanical digestion. Enzymes break down food into little molecules that the body can use during chemical digestion.
Hence the answer is d. duodenum, ileum, caecum, transverse colon.
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