An anti-HIV medication called zidovudine lowers the level of the virus in the body. Anti-HIV medications like zidovudine decrease immune system deterioration and stop the development of AIDS-related diseases.
What are antiviral tablets used for?Antiviral medications are a particular class of medication used to treat viral infections. They work by eradicating or stopping the spread of viruses. Oseltamivir and zanamivir, two antiviral medications, are used to treat the flu (Relenza). One of these might have been recommended to you by someone.
What was the first antiviral drug?The COVID antiviral treatments are really only available to patients at highest risk of contracting serious COVID-19 illness, such as people older than 65 and those who have other medical diseases such as cancer, as well as diabetes that make them more susceptible to severe illness. The first anti - viral, idoxuridine, has been approved in 1963 for applied topically of a herpes simplex virus (HSV).
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why do Forests reach their greatest ecological complexity when they are mature and exhibit a multi-level canopy
Forests reach their greatest ecological complexity when they are mature and exhibit a multi-level canopy due to the many levels of competition for light and resources.
What is ecological complexity?Ecological complexity is a term used to describe the relationships between organisms and their environment. It emphasizes the intricate web of interactions between living organisms and nonliving components of the environment.
As trees grow, they compete for light and resources in several ways. Trees on the upper canopy layers are able to outcompete trees on lower layers for resources because they are able to access more sunlight. In addition, as trees grow taller, they cast larger shadows, further limiting resources for trees in the lower layers. This competition creates a layered forest structure in which different species of plants and animals are adapted to different layers. This structure allows for an increased diversity of species and interactions between them, leading to a more complex and intricate ecological system.
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which event describes a change where evolution has happened?responsesan allele frequency changes in a population., , an allele frequency changes in a population.,a white-eyed fly is born into a population of brown-eyed flies.a white-eyed fly is born into a population of brown-eyed flies.a school of fish moves to a new environment.a school of fish moves to a new environment.,a species of tree dies out.
An allele frequency change in a population is a change where evolution has happened.
Evolution is the process by which species change over time through mechanisms such as natural selection, genetic drift, and mutation. An allele frequency change occurs when the frequency of a particular allele (version of a gene) in a population changes. If a new allele appears in a population, or if the frequency of an existing allele increases or decreases, this can have a profound effect on the population and may lead to evolution. An allele frequency change is a key indicator of evolution because it demonstrates that the genetic makeup of a population is changing over time.
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in order for natural selection to occur within a population, certain conditions must be met. one condition is
Natural selection to occur within a population. The answer is A), which refers to phenotypic changes that are hereditary.
Phenotypic expression is the result of a complex interaction between an object's genes and environment. As they develop and evolve, organisms go through a programmed progression of phenotypic changes. Hence, even in uniform, static contexts, phenotypic expression shifts during growth and development.
Genetic diversity interacts with behavioral and environmental factors to produce phenotypic variation in humans, which is a direct effect. The genetic make-up of a genetic variant and its frequency in the population serve as two key criteria for classification.The nucleolus is a crucial component of protein synthesis because it produces ribosomes. Ribosomes are the cellular organelles responsible for protein synthesis. They are then transferred to the cytoplasm.
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The Complete Question :
In order for natural selection to occur within a population, certain conditions must be met. One such condition is
A. phenotypic variations that are genetic.
B. heterozygosity must be very low.
C. phenotypic differences resulting from environmental conditions.
D. low rates of immigration.
E. frequent mutations that are inherited.
The effects of genetic drift are more pronounced in larger populations.a. True.b. False.
False. The effects of genetic drift are not more pronounced in larger populations.
Genetic drift is a mechanism of evolution that refers to the random fluctuations in the frequency of alleles in a population over time. The effects of genetic drift are more pronounced in smaller populations, because chance events such as genetic mutations or the loss of individuals can have a larger impact on the gene pool of a smaller population. In larger populations, the effects of genetic drift are diluted, as the number of individuals carrying each allele is greater. This means that the frequency of alleles is less likely to be strongly influenced by random events, and is instead shaped more by natural selection and other evolutionary forces. It's important to note that genetic drift can still occur in larger populations, but its effects will be less pronounced than in smaller populations.
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What causes the impairment of voluntary muscle movement?
An issue with the nerves that transmit messages from your brain to your muscles and cause them to contract consistently is what causes loss of muscle function. Skeletal muscles that you can fully control are referred to as voluntary muscles.
Muscular function loss may be partial or total. Partial loss of muscle function, which only affects a region of your body, is the main symptom of a stroke.
Complete muscle paralysis affects your entire body. It frequently affects those who have suffered severe spinal cord injuries.
A loss of muscle function that affects both the top and bottom sides of your body is referred to medically as quadriplegia. When a condition just affects the bottom half of your body, it is referred to as paraplegia. Loss of muscle function is caused by a problem with the nerves that carry signals from your brain to your muscles and cause them to contract regularly. While you're healthy, you have control over your voluntary muscles' ability to move. Voluntary muscles are skeletal muscles that are entirely under your control.
Examples of involuntary muscles that are not under your conscious control include your heart and the smooth muscles in your intestines. Nonetheless, they have a chance of failing as well. Loss of function of involuntary muscles can be fatal.
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47
In cows, the allele for fur color is controlled by codominant alleles. A cow that is homozygous black (FF) is
crossed with a cow that is homozygous white (WW). The offspring produced will be
F
F
W
W
FW
FW
A Gray all over
C Completely black
FW
FW
B Black and white spotted
D Gray and white
Codominant alleles in cows regulate the fur colour allele, meaning that when both the black and white alleles are present in a single person, both alleles express themselves equally.
What are alleles?Alleles are different versions of a gene that exist at a certain locus (position) on a chromosome in genetics. They are in charge of a population's genetic variety and determine several variations of a particular feature, such as eye colour or blood type. Each gene has two alleles, one from each parent, which are present in every person. The individual is homozygous for that gene if both alleles are the same; otherwise, the individual is heterozygous. The dominant allele in a dominant-recessive relationship is expressed in an individual's phenotype, but the recessive allele is only expressed when two copies are present (homozygous recessive).
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How does the comparison of the stages of embryological development of different species help biologists to classify life? a. It helps in understanding the similarities between living species and extinct species.
b. It reveals anatomical similarities that are not always evident in fully formed organisms.
c. It reveals differences in the environmental conditions necessary for species survival.
d. It helps in understanding the different behavioral strategies in different individual organisms.
It reveals anatomical similarities that are not always evident in fully formed organisms. The comparison of the stages of embryological development across species helps biologists to classify life in a variety of ways.
By comparing the embryological development of different species, biologists can identify the commonalities in the developmental processes and draw conclusions about the evolutionary history of the species. These commonalities can be used to trace the evolutionary relationship between species, allowing biologists to classify species into more specific taxonomic categories. Additionally, comparing embryological development can uncover anatomical similarities not always visible in fully formed organisms, providing further insight into the evolutionary relationships between species. This information can be used to group species into more specific taxonomic categories, like genus, or even species. Furthermore, the comparison of embryological development between species can reveal differences in the environmental conditions necessary for species' survival, which can help inform conservation efforts. Finally, the comparison of embryological product between species can also reveal the different behavioural strategies used by individual organisms to survive in different conditions, providing further insight into the evolutionary development of different species.
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how do retrotransposons differ from other transposons?
Transposons in DNA are copied and pasted to migrate. While, the Retrotransposons, on the other hand, replicate the element and copy it into a new chromosomal site using an intermediary RNA.
The Retrotransposons multiply more quickly than DNA transposons, as a result.The Retroelements depend on an RNA transcript that is retro transcribed by a reverse transcriptase before incorporation in the genome, as opposed to DNA-transposons, which amplify without an RNA intermediary.Thus, we can see the difference between Retrotransposons as well as the transposons.
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T/F
Serial dilutions can be used to estimate the total number of bacterial cells in a solution, including living and dead cells.
False. The entire number of bacterial cells in a solution, including live and dead cells, cannot be estimated by serial dilutions.
Serial dilution is the serial dilution of a substance in solution. The dilution factor is usually constant at each step, resulting in a logarithmic geometric series of concentrations. Ten-fold serial dilutions are 1M, 0.1M, 0.01M, 0.001M, etc.
Samples are serially diluted by adding to a series of standard volumes of sterile diluent in either distilled water or 0.9% saline. Then measure a small amount of each dilution to make a series of casts or spreader plates. In microbiology, serial dilution (logarithmic dilution) is used to reduce the concentration of bacteria to the concentration required for a particular test procedure, or seeded onto agar plates.
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which of the following characteristics are not shared by land plants and charophytes? 1. use chlorophyll a, chlorophyll and carotene 2. presence of chloroplasts 3. presence of a cell wall 4. protection of embryo in gametophyte
Protection of embryo in gametophyte is the characteristics are not shared by land plants and charophytes.
Charophytes have chlorophyll a and b, store carbohydrates as starch, have cell walls consisting of cellulose, and undergo similar cell-division processes. Charophytes are non-vascular plants but land plants have well developed vascular tissues like the xylem and phloem. Charophytes do not form embryos but land plants do. Land plants have apical meristem responsible for the growth and exhibit alternation of generation in their life cycle.
Charophytes are the group of green algae whose ancestral lineage gave rise to land plants in what resulted in a profoundly transformative event in the natural history of the planet.
The green algae are basically divided into Charophyte and Chlorophyte algae, and it is agreed that the Charophyte algae are the closest algal relatives of land plants.
Charophytes consist of sporopollenin while land plants consist of the cellulose cell wall. Charophytes have flagellated sperms while land plants have round and non-flagellated sperms.
Protection of embryo in gametophyte is the characteristics are not shared by land plants and charophytes.
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if all other conditions remain the same and the concentration of a nonpenetrating solute increases inside a cell, which is most likely to occur?
If the concentration of a nonpenetrating solute increases inside a cell, the most likely effect is that water will move into cell through osmosis. This is because nonpenetrating solutes are unable to cross the cell membrane, so their concentration gradient cannot be equalized by movement across the membrane. Instead, water will move into the cell to try and dilute the increased concentration of solutes.
Cell will experience an increase in volume, that cause it to swell and potentially burst if concentration of solutes becomes too high. This process is important for maintaining proper fluid balance in cells and is regulated by body through use of ion channels and transporters to control movement of solutes and water across the cell membrane.
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how does domain eukarya different from the domains bacteria and archaea?
Answer:
Explanation:
The three domains of life - Bacteria, Archaea, and Eukarya - are defined based on differences in cell structure, genetic makeup, and biochemistry.
Bacteria are single-celled organisms that lack a nucleus and other membrane-bound organelles. They have a simple cell structure, and their genetic material is contained within a single, circular chromosome located in the cytoplasm.
Archaea are also single-celled organisms that lack a nucleus, but their cell structure and biochemistry are distinct from bacteria. For example, their cell walls are made of different materials, and they are able to survive in extreme environments such as hot springs and salt lakes.
Eukarya, on the other hand, are characterized by cells that contain a nucleus and other membrane-bound organelles. This domain includes all organisms with cells that have a complex structure, including plants, animals, fungi, and protists. Eukaryotic cells have a more complex organization and division of labor compared to bacteria and archaea. Additionally, the genetic material of eukaryotes is contained within a nucleus, which is separated from the cytoplasm by a double membrane.
Overall, the differences between the three domains of life reflect the distinct evolutionary paths that these organisms have taken and the adaptations they have made to survive in their environments.
Paleontologists are studying a specific type of fossil from an organism found in the bottom rock layer of a cliff. Later they notice the same type of fossil in a higher layer on the same cliff. The rock layers are undisturbed – no folding or faulting has taken place. Which of the following is the BEST explanation for why fossils of this organism can be found in multiple rock layers in this cliff? SC.7.E.6.3
A. This particular type of organism lived for a long period of time in the same area
B. The cliff has many faults that have broken down the rocks and moved the fossils
C. This particular type of organism was present in multiple locations on Earth
Why did you choose this answer?
The BEST explanation for why fossils of this organism can be found in multiple rock layers in this cliff is: This particular type of organism lived for a long period of time in the same area. option A is the correct answer.
What are fossils?This refers to the traces of ancient life that have been preserved by natural processes, from spectacular skeletons to tiny sea shells. Fossils are formed in a number of different ways, but most are formed when a plant or animal dies in a watery environment and is buried in mud and silt.
The best explanation for why fossils of this organism can be found in multiple rock layers in the same cliff without any folding or faulting taking place is that this particular type of organism lived for a long period of time in the same area. This phenomenon is known as the Law of Superposition, which states that in undisturbed rock layers, the oldest rocks are on the bottom and the youngest rocks are on the top.
Over time, as new sediment is added to an area, organisms can be buried and preserved in multiple layers, resulting in their fossils being found in multiple rock layers. Therefore, option A is the correct answer.
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Members are able to view meat from the eyes of a USDA inspector during which CDE contest?
Members are able to view meat from the eyes of a USDA inspector during Meats Evaluation and Technology contest.
Career Development Events are known as CDEs. Members can develop the abilities they'll need to succeed in their careers by participating in these competitions.
Meat science is studied by participants in the Meats Evaluation and Technology program. Students analyze beef carcasses for quality and yield grade during this team activity. They also classify various meat cuts and arrange carcasses, as well as identify wholesale and/or retail cuts.
Students who are interested in learning more about or pursuing careers in the animal meat sector should definitely check out this event. Pupils are challenged to strengthen their critical-thinking skills, analytical abilities, and effective communication techniques.
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Which two complementary forces keep the Sun from blowing itself up?A.fusion and magnetism. B.helium and hydrogen
C.photons and magnetism
D.fusion and gravity
The two complementary forces that keep the Sun from blowing itself up are D. fusion and gravity.
Fusion is the process by which hydrogen atoms combine to form helium, releasing a tremendous amount of energy in the form of light and heat. This energy creates an outward pressure that would cause the Sun to expand and blow itself apart if not for the force of gravity, which pulls the Sun's mass inward and counteracts the outward pressure.
The balance between the forces of fusion and gravity in the Sun allows it to maintain a stable size and temperature, with fusion occurring in the core where the pressure and temperature are high enough for the fusion process to take place. This balance is delicate, however, and any significant disruption to the forces involved could have catastrophic effects on the Sun's stability and ultimately on the survival of life on Earth.
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Which molecular process is found only in retroviruses?
Transduction of cellular genes molecular process is found only in retroviruses.
A retrovirus is a type of virus that inserts a DNA copy of its RNA genome into the DNA of a host cell that it infects, modifying the genome of that cell. Once within the host cell's cytoplasm, the virus employs its own reverse transcriptase enzyme to generate DNA from its RNA genome, which is the opposite of the usual pattern, so retro. The new DNA is then incorporated into the host cell genome by an integrase enzyme, at which time the retroviral DNA is referred to as a provirus. The host cell then treats the viral DNA as part of its own genome, transcribing and translating the viral genes alongside the cell's own genes, creating the proteins required to build new copies of the virus.
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why do you think it's only considered a frameshift mutation if it's a non-multiple of 3 nucleotide bases?
A frameshift mutation results in new codons downstream of the mutation that will code for various amino acids, altering the characteristics of the translated proteins.
The process of a sudden, heritable alteration in an organism's genome is known as mutation. Point mutations and frameshift mutations are the two primary forms of mutation. The single base pair only undergoing a change at a single place is referred to as a point mutation. Due to the deletion's alteration of the gene's reading frame sequence, it is also referred to as a frameshift mutation. These changes could be advantageous or detrimental to the organisms. During the loss of one of two nucleotides, a frameshift mutation takes place. A frameshift mutation is one that unquestionably alters the order of codons downstream of the mutation. A replacement mutation, on the other hand, only affects one codon's single nucleotide.
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The process of producing glucose from noncarbohydrate sources is called:
a. glycolysis.
b. gluconeogenesis.
c. glycogenolysis.
d. lipolysis.
The process of producing glucose from noncarbohydrate sources is called gluconeogenesis.
What are the steps in the gluconeogenesis.?Gluconeogenesis is a metabolic pathway that involves the conversion of non-carbohydrate sources, such as amino acids, lactate, and glycerol, into glucose. The main steps in gluconeogenesis are:
Pyruvate carboxylation: Pyruvate, an end product of glycolysis, is converted to oxaloacetate by the enzyme pyruvate carboxylase.
Conversion of oxaloacetate to phosphoenolpyruvate: Oxaloacetate is converted to phosphoenolpyruvate (PEP) by a series of reactions that involve the enzymes PEP carboxykinase and enolase.
Conversion of fructose-1,6-bisphosphate to fructose-6-phosphate: Fructose-1,6-bisphosphate is converted to fructose-6-phosphate by the enzyme fructose-1,6-bisphosphatase.
Conversion of glucose-6-phosphate to glucose: Glucose-6-phosphate is converted to glucose by the enzyme glucose-6-phosphatase.
These steps require energy input in the form of ATP and other cofactors, and they occur mainly in the liver and kidneys.
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gram positive cellshave a second, outer membrane that helps retain the crystal violet stain.have multiple layers of peptidoglycan that help retain the crystal violet stain.have a thick capsule that traps the crystal violet stain.none of these options.
Gram positive cells have a option B. multiple layer of peptidoglycan that helps to retain the crystal violet stain.
Gram staining is a technique for determining whether bacteria are gram-positive or gram-negative. These bacteria will be distinguished based on whether the stain reveals the bacteria to be purple or pink.
Gram-positive cells have several layers of peptidoglycan that allow them to maintain the crystal Violet stain. As a result, gramme positive bacteria appear violet during the gramme staining method.
As a result, the right answer is B. a multiple layer of peptidoglycan that aids in the retention of the crystal violet stain
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Complete Question is:
Gram positive cells have a
A. second outer membrane that helps to retain the crystal violet stain
B. multiple layer of peptidoglycan that helps to retain the crystal violet stain
C. thick capsule that traps the crystal violet stain
D. periplasmic space that traps the crystal violet
True or false? Genetic drift is more significant in small populations.
True. Smaller populations experience greater genetic drift.
Owing to stochastic sampling error, smaller populations typically lose their genetic diversity less quickly than larger populations (i.e., genetic drift). The reason for this is that tiny populations make it more likely for some gene variants to be lost through random chance. A mutation's frequency in a population may shift randomly from one generation to the next due to the population's limited size. This phenomenon is known as genetic drift. Small, reproductively phenotypic traits may experience rapid changes in gene frequencies due to unique conditions that are completely unrelated to mutation and natural selection. Only random variables can explain these fluctuations.
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which bacteria group has a thick peptidoglycan layer?
Gram-positive bacteria are the type of bacteria that have a thick peptidoglycan coating.
Gram-positive bacteriaBecause these bacteria retain the crystal violet dye used in the Gram staining procedure, which turns their thick peptidoglycan layer purple, they are known as "Gram-positive" bacteria. Gram-negative bacteria, on the other hand, have an outer sheath that contains lipopolysaccharides, which inhibits the crystal violet stain from adhering, and a thinner peptidoglycan layer, which makes them appear pink after being counterstained with safranin in the Gram staining method.The peptidoglycan layer, which offers structural support and guards against osmotic lysis, is a crucial part of the bacterial cell wall. The peptidoglycan layer makes up up to 90% of the weight of the cell wall in Gram-positive bacteria, which have a much thicker coating than Gram-negative bacteria.Gram-positive bacteria come in a wide variety of species that fall under distinct genera and families. Here are a few instances of Gram-positive microorganisms:A spherical-shaped bacteria called Staphylococcus aureus, which is a normal component of human skin flora and can result in illnesses such as skin infections, pneumonia, and sepsis.A spherical-shaped bacteria called Streptococcus pyogenes is responsible for a number of illnesses, including strep throat, skin infections, and sepsis.learn more about Gram-positive bacteria here
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What diversity refers to all the different genes contained within all members of a population.speciesecosystemgeneticcharacter
Genetic diversity is the term used to describe all the many genes that exist in every member of a community.
It is a measurement of the genetic diversity among members of the same species within a population of individuals. A species' capacity to survive and adapt depends on its genetic variety because it promotes the operation of natural selection and permits populations to adjust to environmental changes. Losing genetic variety can have unfavorable effects, such as lowering a population's ability to withstand environmental stresses and raising disease susceptibility. Genetic recombination during sexual reproduction, genetic mutations, and population movement are the causes of this variance. The basic components of heredity that regulate an organism's traits are called genes. Genetic diversity, which in turn defines the features and characteristics of the people within a group, is based on the diversity of genes within a population.
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why is it necessary to clear out dna methylation during the production of gametes?
It is necessary to clear out DNA methylation during the production of gametes because DNA methylation is an epigenetic modification that can affect gene expression and regulation.
During the production of gametes, the DNA in the germ cells is extensively reprogrammed to erase the DNA methylation patterns that have accumulated during the development and aging of the parent. This is necessary to prevent the inheritance of epigenetic marks that may affect the proper development of the embryo and subsequent generations. Clearing out DNA methylation during gamete production is also important for ensuring proper imprinting, which is regulated by DNA methylation and expressed in a parent-of-origin-specific manner. Proper erasure and re-establishment of DNA methylation patterns during gametogenesis are crucial for the maintenance of proper imprinting in the offspring. Clearing out DNA methylation during gamete production ensures the proper development and health of the offspring and subsequent generations by preventing the inheritance of epigenetic marks that may affect gene expression and regulation.
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What layer are the tectonic plates moving on?
Answer:
mantle
Explanation:
Earth's thin outer shell is broken into big pieces called tectonic plates. These plates fit together like a puzzle, but they're not stuck in one place. They are floating on Earth's mantle, a really thick layer of hot flowing rock.
Answer:
mantle
Explanation:
what is the structural difference between atp and datp? what is the structural difference between atp and datp? atp has a 2' oh and 3' oh datp has a 2' h and 3' oh atp has a 2' oh and 3' oh datp has a 2' oh and 3' h atp has a 2' h and 3' oh datp has a 2' oh and 3' oh atp has a 2' oh and 3' h datp has a 2' oh and 3' oh
The structural difference between ATP as well as dATP will be ATP has a 2' OH and 3' OH, while dATP has a 2' H and 3' OH. Option A is correct.
The structural difference between ATP (adenosine triphosphate) as well as dATP (deoxyadenosine triphosphate) is that dATP has a deoxyribose sugar while ATP has a ribose sugar. The ribose sugar in ATP has a hydroxyl group (-OH) attached to both the 2' and 3' carbons, while in dATP, the 2' carbon has a hydrogen atom (-H) instead of the hydroxyl group, and the 3' carbon has a hydroxyl group (-OH).
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--The given question is incomplete, the complete question is
" what is the structural difference between ATP and dATP? A) ATP has a 2' OH and 3' OH dATP has a 2' H and 3' OH B) ATP has a 2' OH and 3' oh dATP has a 2' OH and 3' h C) ATP has a 2' H and 3' OH dATP has a 2' OH and 3' OH D) ATP has a 2' OH and 3' H dATP has a 2' OH and 3' OH"--
the anatomy of the intrinsic conduction system causes contraction of the ventricles to begin at the apex and move superiorly. why is this important? view available hint(s)for part a the anatomy of the intrinsic conduction system causes contraction of the ventricles to begin at the apex and move superiorly. why is this important? so blood is forced upward, toward the semilunar valves so the atria can finish contracting before the ventricles contract because the av bundle is the only electrical connection between the atria and the ventricles because the purkinje fibers conduct action potentials away from the heart apex
Starting at the apex, contraction forces blood upward, through the semilunar valves, and into the aorta and pulmonary trunk.
It allows the pumping of blood upwards towards the respective blood vessel from each ventricle.
From the right ventricle, blood is pumped upwards into the pulmonary artery while the left ventricle pumps the blood upwards into the aorta. The contraction of the ventricle starts at the apex and moves upwards to pump the blood from the left and right ventricle into the aorta and pulmonary artery respectively.
The aortic and pulmonary valves are called semilunar valves. As the blood pressure in ventricles exceeds the pressure in the aorta and pulmonary arteries, the semilunar valves are opened and blood is pumped into respective arteries.
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The fluid mosaic model of the membrane proposed that membranes:A Consist of a single layer of phospholipids and proteins.B Consist of a phospholipid bilayer composed of a variety of fatty acids.C Consist of protein molecules embedded in a dynamic bilayer of phospholipids.D Consist of a phospholipid bilayer between two layers of hydrophilic proteins.
The correct answer is option C. According to the fluid mosaic model of the membrane, proteins are encapsulated in a dynamic bilayer of phospholipids in membranes.
S.J.'s hypothesis states that the cell membrane. G.L. Singer and is made up of a protein-coated phospholipid bilayer, according to Nicolson in 1972.
The phospholipid bilayer is constantly changing as a result of the numerous internal and external stimuli it is exposed to, and the proteins create a mosaic of different configurations.
The proteins may interact with the polar head groups of the bilayer and the nonpolar core of the membrane because they are amphipathic or have both hydrophilic and hydrophobic areas.
The proteins are necessary for signal transduction, molecular transport, and cell-to-cell recognition. The barrier that controls how chemicals enter and leave the cell is the semi-permeable phospholipid bilayer.
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Muscles are not likely to tear from their bones because Select one: a. the tendons are partially ossified at their attachment points to the periosteum. b. a circumferential lamella sandwiches the ends of the tendon onto the surface of an adjacent lamella. c. perforating fibers of collagen attach the tendons and periosteum to the cortical surfaces of bone. d. elastin fibers in the tendon can allow for stretching and recoil of the muscle.
Because collagen perforating fibers connect the tendons and periosteum to the cortical surfaces of bone, it is unlikely that muscles will separate from their bones.
Sharpey's fibres, which extend to the outer circumferential and interstitial lamellae of bone, are strong collagenous fibers that bind the periosteum to the bone. An outside "fibrous layer" and an inner "cambium layer" make up the periosteum. The cambium layer contains progenitor cells that eventually become osteoblasts, which widen the bone, whereas the fibrous layer contains fibroblasts. The progenitor cells that form osteoblasts and chondroblasts after a bone fracture are crucial to the healing process. It has nociceptive nerve endings, which makes it more sensitive to manipulation than bone itself does.
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niacin is multiple choice question. necessary for the formation of the collagen matrix of bone. a coenzyme in metabolic reactions that yield energy from food. an electrolyte that helps to maintain fluid balance in the cells. an antioxidant that protects cell membranes from damage by free radicals.
Niacin is a coenzyme in metabolic reactions that yield energy from food. So option b. is the correct answer. Niacin is a B vitamin that's produced and utilized by your body to turn food into energy.
Niacin (vitamin B-3) is usually part of a daily multivitamin, but most people get sufficient niacin from the food they consume. Foods rich in niacin comprise yeast, milk, meat, tortillas, and cereal grains. It enables you to keep your nervous system and skin healthy. The key function of niacin in your body is to synthesize the coenzymes nicotinamide adenine nucleotide (NAD) and nicotinamide adenine dinucleotide phosphate (NADP), which are implicated in over 400 biochemical reactions in your body - primarily affiliated with obtaining energy from the food you consume.
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when phospholipids are placed in water they spontaneously from a bilayer with which of the following
- the polar heads on the surface and the non polar tails in the interior
- the polar heads on the surface and the non polar tails in the exterior
When phospholipids are placed in water they spontaneously form a bilayer with the polar heads on the surface and the nonpolar tails in the interior because fatty acid tails are poorly soluble in water therefore phospholipids at that moment form bilayers in aqueous solutions, Then the hydrophobic tails buried in the interior of the membrane and the polar head groups exposed on both sides.
The arrangement of this lipid bi layer consists of head containing phosphate group, which has a polar character or negative charge, and an area called the tail (the fatty acids), which is neutral. Therefore the head can form hydrogen bonds, but the tail cannot. Therefore the head remains outside forming hydrogen bonds with the water molecules that's why they are called hydrophilic.
On the other hand the tail remains in the interior that's why they are hydrophobic.
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