Genetic drift is an evolutive force that affects small populations and changes their allelic and genotypic frequencies by randomly fixating some alleles and eliminating others. Option A) Genetic Drift.
What is genetic drift?Genetic drift is an evolutionary mechanism in which the allelic frequencies in a population change through many generations. Its effects are harder in a small-sized population.
Genetic drift results in some alleles loss, even those that are beneficial for the population, and the fixation of some other alleles by an increase in their frequencies. The final consequence is to randomly attach one of the alleles.
Two events that involve genetic drift are the bottleneck effect and the founder effect.
Now we need to define which option is the best.
We have two small populations (25 and 40 indviduals)One of the populations is AA while the other one is aaThey are separated and far away from each otherThey are under equal environemntal conditionsWhat happened?
Gene flow
This is not the case, because gene flow decreases heterogeneity between populations, reducing genetic variation. Besides if these populations are far away, gene flow would be difficult.
Nonrandom matings
This is not the case, because with nonrandom mating there would not be such a change in frequencies.
Directional selection
Directional selection does not seem to be the cause either, because both populations are under the exact same environmental conditions, so pressures acting on them are the same. There is no change in this aspect.
Genetic Drift
I believe this is the best option. Genetic drift causes a change in allele frequencies and affects small populations. These populations might have been separated for a long time, and suffered the effects of genetic drift. It might be a founder effect case, with the smaller population being the newest one.
The correct option is Genetic Drift. Option A.
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Complete question
One population of a species has 25 individuals, all with genotype AA; a second population of this species has 40 individuals, all with genotype aa.
Assume that these populations live far apart but in similar environmental conditions.
Based on this information, the observed genetic variation most likely resulted from.
(A) genetic drift.
(B) gene flow
(C) nonrandom mating.
(D) directional selection.
The cells that rhythmically and spontaneously generate action potentials in the heart are called ___
The cells that rhythmically and spontaneously generate action potentials in the heart are called pacemaker cells
The pacemaker cells are the ones that help in the maintenance of the action potential and that action potential work as an electrical clock that provides the automaticity to coordinate the pacemaker cells it divides the action potential into 4 phases among which in phase 4 the ion channels open that conducts slow, inward ( depolarizing Na+ ) currents and they are called as funny currents which cause the membrane potential to spontaneously depolarize, thereby initiating phase 4 and at the -50mV T type Ca 2 + channels open and further depolarize the cells and in some way, L type Ca+ channel opens when membrane reaches -40mV and this further results in the more Ca+ enter to depolarize the cell further until an action potential threshold is reached.
At phase 0 depolarization is primarily caused by increased Ca+ current through L-type channels that began to open toward the end of phase 4.. In contrast, the T-type channel's Ca+ current slows as these channels close and in phase 3 K+ channels open thereby increasing the outward directed hyperpolarizing K+ winds and decreases the inward of Ca+ and hyperpolarization takes place and then again enter in phase 4 hence the pacemaker cells maintain the action potential by dividing and circulating in 3 different phases.
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Compared with ³¹P , the radioactive isotope ³²P has a. a different atomic number. b. one more proton. c. one more electron. d. one more neutron.
Compared with ³¹P , the radioactive isotope ³²P has one more neutron.
Radioactive isotopes is an unstable element form which breaks down into simpler form releasing the energy in the form of radiation to become more stable.
They usually have short life span and decay to stable form hence they are present only in small quantities.
Radioactive isotope of P-32 have 15 protons, and 17 neutrons while the common isotope of P-31 have 15 protons and 16 neutrons.
Radioactive P-32 have application in laboratory to label DNA and proteins to treat various diseases.
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Which of the following is not properly paired? a. seminiferous tubule-cervix b. vas deferens-oviduct c. testosterone-estradiol d. scrotum-labia majora
The answer is the seminiferous tubule cervix.
What is a seminiferous tubule?
The seminiferous tubules offer a special setting for the development of germ cells. Germinal components and supporting cells are included in the structures engaged in this process. The Sertoli cells and the basement membrane's peritubular cells are examples of supporting cells. The germinal elements are made up of a population of epithelial cells, including spermatogonia, which proliferate quickly, spermatocytes going through meiosis, and metamorphosing spermatids. The "blood-testis barrier" is another habitat that is produced by the seminiferous tubule. Although the maturing germ cells in the testis are potentially antigenic and identifiable as foreign, no immune reactivity is often seen there. This makes the testis distinctive.
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When you breathe, oxygen moves from your lungs into your blood and then into tissues. To do this, oxygen moves across membranes by ______ and from ______ concentration of oxygen.
When you breathe, oxygen moves from your lungs into your blood and then into tissues. To do this, oxygen moves across membranes by diffusion and from higher to lower concentration of Oxygen.
What occurs after oxygen leaves the lungs and enters the blood?The air sacs' flimsy lining allows oxygen from the inhaled air to cross across and enter the blood vessels. Diffusion refers to this. The bloodstream then transports the oxygen in the blood throughout the body, allowing it to reach every cell. The bloodstream releases carbon dioxide as oxygen enters it.
Diffusion is the process of movement of molecules higher to lower concentrations.
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the white matter of the spinal cord contains . group of answer choices myelinated nerve fibers only unmyelinated nerve fibers only myelinated and unmyelinated nerve fibers soma that have both myelinated and unmyelinated nerve fibers
Option A: the white matter of the spinal cord contains myelinated nerve fibers only.
The central nervous system (CNS) comprises the brain and spinal cord. It generally contains two types of tissues: white matter and gray matter. White matter appears pinkish white while the gray matter is a darker hue. White matter is located in the outer regions of the CNS while the gray matter is located closer to the CNS.
The white matter of the central nervous system consists of myelinated nerve fibers. This further means that it contains axons that are covered by a protected covering of myelin. The characteristic color of white matter is acquired from myelin which is generally made up of lipid tissue. Myelin protects the nerve fibers from any injury.
The white matter of the spinal cord is composed of axons that are covered by myelin. The primary function of white matter is to coordinate and signal a to and fro motion between the brain and the spinal cord.
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How does air in the lungs differ from the fresh air that enters the body during inspiration?
During inspiration, the diaphragm and external intercostal muscles flex, causing the rib cage to enlarge and move outward as well as the thoracic cavity and lung volume. Because the internal pressure is lower than the ambient pressure, air is drawn into the lungs.
Where on the body is the thoracic region?The thoracic spine is present in the upper and middle part of the back. Twelve vertebrae, designated T-1 through T-12, make up the thoracic spine. T-1 through T-5 nerves have an impact on the mid-back, abdominal, and upper chest muscles. The spinal column is numbered, and each number represents a section of the spinal cord's associated nerves.
What results in thoracic pain?Inflammation of the thoracic spine's muscles or soft tissues is the most typical cause of thoracic back pain. There are several causes of this inflammation, including abrupt sprains or strains (as in car accidents or sports injuries). slouching while standing or sitting over time.
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The movement of water in and out of the renal tubules can be increased or decreased. the tubular cells are able to do this, by changing the number of water channels, also called?
The movement of water in and out of the renal tubules can be increased or decreased. the tubular cells are able to do this, by changing the number of water channels, also called Aquaporins.
Nephrons are the structural and functiona unit of kidney. It is divided into different parts like glomerulus, proximal convulated tubule, distal convulated tubule, loop of henle and collecting duct which performs different function of urine formation.
Renal tubule is the part of the nephron that consist of proximal convulated tubule, distal convulated tubule, loop of henle.
Renal tubules have water channels called aquaporins which helps in transporting water into the cell. They can increase or decrease the number of water channel to control the concentration of urine.
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the fibrin clot begins to form when fibrinogen is cleaved resulting in a fibrin monomer, fibrinopeptide a, and fibrinopeptide b fragments. the fibrin monmers sponaneously polymerize due to hydrogen bonding, and then are covalently linked into fibrin polymers by which factor?
The factor involved in the process is Factor XIII.
What is clotting of blood?Blood is said to clot when a solid mass appears over the point where the skin has been injured. The appearance of a clot would stop the bleeding over the point that has been affected by the injury.
There are many biological factors that contribute to the clotting of blood. The fibrin clot begins to form when fibrinogen is cleaved resulting in a fibrin monomer, fibrinopeptide a, and fibrinopeptide b fragments. The fibrin monomers spontaneously polymerize due to hydrogen bonding, and then are covalently linked into fibrin polymers by Factor XIII.
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A chicken has 78 chromosomes in its somatic cells. How money chromosomes did the chicken inherit from each parent? How many chromosomes are in each of the chicken's gametes? How many chromosomes will be in each somatic cell of the chicken's offspring?
If a chicken has 78 chromosomes in its somatic cells, then it has inherited half the number of chromosomes from each parent i.e 39 from each parent. There are 39 chromosomes in each of the chicken's gamete. There will be 78 chromosomes in each somatic cell of the chicken's offspring.
The gamete cells divide by the process of meiosis whereas the somatic cells divide by the process of mitosis.
During the process of meiosis, the number of chromosomes is reduced to half. Hence, the gamete cells contain half the number of chromosomes as the somatic cells. If fertilization occurs, the other half of the number of chromosomes is inherited from the other parent. Hence, a chicken will inherit half the number of chromosomes from each parent.
Somatic cells in the body divide by the process of mitosis. The process of mitosis produces genetically identical copies. Hence, the chromosome number will remain the same i.e 78 in the somatic cell of the chicken's offspring.
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Three-chambered hearts with incomplete septa were once viewed as being less adapted to circulatory function than mammalian hearts. What advantage of such hearts did this viewpoint overlook?
Because some oxygen-depleted blood from the systematic circuit that was returned to the right ventricle would have mixed with the oxygen-rich blood in the left ventricle, the O2 level would be unusually low.
Why do certain animals' hearts have three chambers?Amphibians and reptiles have three chambers in their hearts for the following reasons: Their lower metabolic rates result in a lower oxygen need per litre of blood. A frog's heart, for example, contains three chambers: one ventricle and two atria.
What are the advantages of a three-chamber heart?A three-chambered heart is preferable to a two-chambered heart because it can exert greater pressure on the blood arteries to guarantee that oxygenated blood flows into the body and deoxygenated blood is sent to the lungs.
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Which type of cell has a cell wall?
A. Human skin cell
B. Animal cell
C. Fungi
D. Virus
Answer: Fungi
Explanation:
(Explanation from samiyah83)
Examples of organisms with cell walls are plants, fungi, protists (particularly molds and algae), and most bacteria (a few exceptions are mycoplasma and L-form bacteria) have cell walls. Animals and heterotrophic protists do not have cell walls.
How is the lunar-linked rhythm of fiddler crab courtship similar in mechanism and function to the seasonal timing of plant flowering? (See Concept 39.3.)
In both cases, the detection of periodic variation in the environment results in a reproductive cycle timed to environmental conditions that optimize the opportunity for success.
What is lunar-linked rhythm ?Seashore plants and animals are subjected to a rhythmic change by the lunar tidal rhythm, which is the regular ebb and flow of oceans and very large inland bodies of water. Typically, two high and two low tides occur each day (about 24.8 hours).
Circadian rhythms provide a crucial function by preparing your body for impending environmental changes including, for instance, the best times to be active, sleep, and eat. The sun's light/dark cycle is the most powerful external stimulus.Learn more about Circadian rhythm here:
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paleolithic cooking vessels such as the jomon vessel were decorated by pressing slender ribs of onto the body of the pot in a diamond pattern?
Jomon ceramic vases are the oldest in the world and their printed decoration, reminiscent of a rope, is the origin of the word jomon, which means 'cord pattern'. not diamond pattern.
What is Jomon ceramic vases?Most Jomon pottery has rounded bases and the vases are typically small. This shows that the pots would typically be used for cooking food, perhaps suitable for a campfire. Later pieces of Jomon pottery are more elaborate, especially during the Middle Jomon period, where the edges of pots became much more intricate and decorated.
With this information, we can conclude that The name Jomon itself means “standard rope”. This refers to the impressions on the ceramic surface that were created by pressing strings into the clay before it was heated to approximately 600-900 degrees Celsius.
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Which best describes the role of communication in scientific investigations?
O Communication can help identify good scientific questions to further investigate.
O Communication is not necessary once the data are collected because the scientists can d
themselves.
O Communication should not be used in planning the experimental design because the scien
ideas.
O Communication is important because the scientists need to convince other researchers not to challenge their results
Answer:
Communication can help identify good scientific questions to further investigate.
Explanation:
How is a mailing address analogous to biology's hierarchical taxonomic system?
Mailing address analogous to biology's hierarchical taxonomic system is written going from broader to narrower.
How is a mailing address analogous to biology's hierarchical taxonomic system?
Postal addresses are analogous to the hierarchical taxonomic system of biology in that each unit has a unique identifier. In postal addresses, the units are houses, and each of them belongs to a certain street in a certain suburb of a certain city. In taxonomy, the units are species and each of them belongs to a certain genus of a certain family of a certain order of a certain class. No two species have exactly the same taxonomic names, just as no two houses will have the same address.To learn more about mailing address analogous, refer to:
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Which is an abiotic factor? a a polar bear on an ice floe b a forest of deciduous trees c fungi and moss on a rotting log d an ocean current of cold water
The abiotic factor is (d) an ocean current of cold water.
Abiotic factor are those that do not perform the basic processes of life. These processes are: respiration, excretion, digestion, movement and reproduction. Although these factors do not perform any life processes, yet they are essential for the environment and the living organisms to sustain. The examples are: water, sunlight, soil, rocks, etc.
Ocean currents are the movement of ocean water. This movement is regulated by several factors like gravity, direction of wind, density of water, climate, etc. The ocean water can have movement in two directions: vertical and horizontal.
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Which of the following is not a major activity of the stomach? a. mechanical digestion b. HCl production c. nutrient absorption d. enzyme secretion
c. nutrient absorption is not a major activity of the stomach
What is the stomach's main function?Acid and digestive enzymes are produced by the stomach. The stomach is lined with , which are ridges of muscular tissue. Periodically contracting, the stomach muscles churn the food to speed up digestion. Food can go from the stomach to the small intestine when the pyloric sphincter, a muscle valve, relaxes.
Propulsion—peristaltic smooth muscle contractions that move food from the fundus to the constricted pylorus—is how mechanical digestion happens in the stomach.
As the muscular layers in the stomach lining flex, a mixing and churning action is created, which is mechanical digestion.
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The cell membrane is _______ (or selectively permeable), meaning it controls the passage of molecules in and out of the cell. p/orn
Answer: The answer is semipermeable
Explanation:
What is the purpose of all interactions among the components of a climate system?(1 point) to assist human activities such as shipping and farming to assist human activities such as shipping and farming to transport different species of animals around the globe to transport different species of animals around the globe to create various weather patterns on earth to create various weather patterns on earth to transfer thermal energy around the world
The main purpose of all interactions among the components of a climate system is to create various weather patterns on earth. So, the correct option is C.
The earth's surface is where several elements of the climate system come together. Modeling (or recreating) the climate system requires an understanding of its many sections or components.
This chapter outlines the fundamental elements of the Earth that make up the climate system, as well as the fundamental scientific concepts and vital procedures required to model each of these elements.
The Atmosphere, Ocean, Ice, and Land are some of these elements. Individual processes are often gathered into a model of one system component, with the climate system being depicted as a collection of building blocks.
To depict the overall climatic system, the components are connected to other components. The ability to construct a representation of the system, such as a climate model, depends on being able to comprehend and then depict the interactions between processes and between components.
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question which hormones does the body release under stress? estradiol and luteinizing hormone estradiol and luteinizing hormone estrogen and progesterone estrogen and progesterone epinephrine and norepinephrine epinephrine and norepinephrine insulin and prolactin insulin and prolactin
epinephrine and norepinephrine hormones the body release under stress
What hormone produced by the adrenal gland is involved in the stress response?The adrenal medulla, the innermost region of the adrenal gland, regulates the chemicals that trigger the flight or fight response. The adrenal medulla secretes two primary hormones: epinephrine (adrenaline) and norepinephrine (noradrenaline), which have comparable roles.
Cortisol is known as the stress hormone because it is implicated in stress responses. It raises blood sugar, raises blood pressure, and lowers immunological responses.
Cortisol influences various parts of your body, primarily regulating your body's response to stress.
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Answer: epinephrine and norepinephrine hormones the body release under stress
Explanation: When brain go brrr, its makes these chemicals so brain can stop going brrr.
Compare the concentrations listed in the table for methadone and phenobarbital. Which concentration is higher? By how much?
Combining methadone with drugs that depress the central nervous system, such as phenobarbital, can have severe adverse effects, including breathing difficulties, unconsciousness, and even death.
What is methadone?Methadone is a drug that the Food and Drug Administration (FDA) has licensed for both pain management and medication-assisted therapy (MAT) for opioid use disorder (OUD). Methadone is a safe and reliable drug when used as directed.
Methadone assists people in achieving and maintaining recovery as well as reclaiming active and fulfilling lives. A complete treatment program that combines counseling and other behavioral health therapies in order to provide patients with a whole-person approach also incorporates methadone as one of its components.
Therefore, combining methadone with drugs that depress the central nervous system, such as phenobarbital, can have severe adverse effects, including breathing difficulties, unconsciousness, and even death.
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Many spontaneous reactions occur very slowly. Why don't all spontaneous reactions occur instantly?
Many spontaneous reactions occur very slowly and all spontaneous reactions occur instantly because if the spontaneous reaction has a high activation energy that is rarely attained, the rate of the reaction may be low.
What is a Spontaneous reaction?This refers to the type of reaction which proceeds on its own and favors the formation of the products without an external energy being added to the system.
In a chemical reaction, the activation energy which is the minimum amount of energy that must be provided for a chemical reaction to occur varies according to different factors.
In a situation whereby the spontaneous reaction has a high activation energy, it becomes difficult for it to be attained and the reaction is slower while if the activation energy is low then then it is easier for it to be attained and the reaction is faster.
This is therefore the reason why all spontaneous reactions won't occur instantly.
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PLease please please help i really need this
In humans the kidneys control the amount of water, salts and other solutes leaving the body by sieving blood through their millions of twisted tubules. When a person drinks too much water in a short period of time, the kidneys cannot flush it out fast enough and the blood becomes waterlogged. Drawn to regions where the concentration of salt and other dissolved substances is higher, excess water leaves the blood and ultimately enters the cells, which swell like balloons to accommodate it.”
How could the process of osmosis explain this phenomenon? Support your answer with evidence from the text above.
Type your answer in the space below
Water molecules moves from the diluted blood to cells where there are more dissolved solutes across the cell membranes through the process of osmosis.
What is osmosis?
Osmosis is the process by which water moves across a semi-permeable membrane from regions of low solute concentration to regions of low solute concentration.
The movement of water molecules is down their concentration gradient as the fewer number of solute molecules in one region of results n water molecules moving across the semi-permeable membrane to where there are fewer water molecules.
When an individual takes in water more than the kidney can remove from blood at a given time, the water molecules moves from blood to cells where there are more dissolved solutes across the cell membranes through the process of osmosis.
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Regular distribution is observed for many organisms due to _______. a. the need to maximize exposure to sunlight b. the need to avoid predators c. interactions between individuals d. the plentiful availability of water please select the best answer from the choices provided a b c d
Answer:
The answer is C.
Explanation:
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When dna fragments are separated using gel electrophoresis and transferred to a blot it is called a:____.
When DNA fragments are separated using gel electrophoresis and transferred to a blot it is called a southern blot.
In the field of molecular biology, we can define southern blot as a method through which a particular DNA fragment is detected from amongst a DNA sample.
The method of southern blotting has important uses such as the detection of diseases, for finding out a DNA segment in a DNA library.
In the method of southern blotting, the DNA sample is first cut by using restriction enzymes. Then the sample is run by the method of gel electrophoresis due to which the smaller segments move at a faster speed than a larger one along a matrix. The DNA segments are then transferred to a blot. The DNA is marked by a tag, referred to as a probe, using radioactive, fluorescent or any other technique. This tag will allow the detecting of our desired DNA segment when a complementary segment is run referred.
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comparative study of phrenic and intercostal nerve transfers for elbow flexion after global brachial plexus injury
Comparative study of phrenic and intercostal nerveGlobal brachial plexus injuries (BPIs) give out the result as devastating events frequently resulting in severe functional impairment. The widely used nerve transfer sources for elbow flexion in patients with global BPIs include intercostal and phrenic nerves.
The comparative study of the phrenic and intercostal nerve that transfers after global brachial plexus injury for purpose of elbow flexion is studied and the aim of this study was to do a comparison for elbow flexion after global BPI.
A retrospective review of 33 patients treated with phrenic and intercostal nerve transfer for elbow flexion in posttraumatic global root avulsion BPI was carried out. In the phrenic nerve transfer group, the phrenic nerve was transferred to the anterolateral bundle of the anterior division of the upper trunk (23 patients); in the intercostal nerve transfer group, three intercostal nerves were coapted to the anterolateral bundles of the musculocutaneous nerve.
The efficiency of motor function in the phrenic nerve transfer group was 83%, while it was 70% in the intercostal nerve transfer group.
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The unicellular glands that directly and specifically secrete mucus are also called ________ cells.
The unicellular glands that directly and specifically secrete mucus are also called goblet cells.
In order words, goblet cells are refers to unicellular glands which directly and specifically secrete mucus.
These goblet unicellular gland cell are of economic importance as they help in the production and maintenance of the protective mucus blanket by producing molecular glycoproteins called mucins.
Unicellular glandsThese are gland which functions only as a single gland and are characteristized by just single cells only.
So therefore, the unicellular glands that directly and specifically secrete mucus are also called goblet cells and are of great economic importance simply because they help in the production and maintenance of the protective mucus blanket by producing molecular glycoproteins called mucins.
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How is habitat disturbance absolutely necessary for the long-term survival of the woodpecker?
The habitat destruction leads to urbanization and increase in richness of woodpecker species.
In urban settings, woodpeckers are relatively frequently recorded. Their habitat preferences and the habitat quality of the territories found in an urban matrix are not, however, thoroughly investigated. Urbanization may lead to the depletion of dead wood resources, which are essential for the existence of woodpeckers. Dead wood resources, which generally took the form of dead tree limbs, were a key factor in the richness of a society.
Municipal greenery offers very few dead wood supplies, hence woodpeckers stayed away from this type of habitat. Studies revealed a correlation between species abundance and the availability of dead wood and canopy covering. According to certain research, less tended urban green spaces are essential for the presence of woodpeckers, and management of urban greenery is a significant factor that affects woodpecker assemblage.
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If a culture of liver cells were deprived of amino acids, which category of macromolecule would the liver cells not be able to construct properly?.
The liver cells wouldn't be able to produce the macromolecules in the protein category adequately.
Describe a macromolecule:A macromolecule, such as a protein or nucleic acid, is a very big molecule crucial to biophysical processes. It is made up of many atoms that are covalently bound. The smaller molecules known as monomers are the building blocks of many macromolecules. More atoms make up macromolecules than there are in regular molecules.
What is the function of macromolecules?The job of macromolecules is to sustain structures. act as a repository for fuel to maintain and retrieve genetic data.
What is an example of a macromolecule?Proteins, nucleic acids, and polysaccharides are typical examples of macromolecules.
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Which of the following animals generally has the lowest volume of urine production? a. vampire bat b. salmon in fresh water c. marine bony fish d. freshwater bony fish
The following animals generally has the lowest volume of urine production
c. Marine bony fish
All bony fish have segmented fin rays that are derived from their epidermis and sutures in their neurocranium. Both bony fish and cartilaginous fish have gills for breathing, but the gills of bony fish are protected by a hard, bony plate. Bony fish may also have prominent rays, or spines, in their fins; this characteristic is known as a "operculum".
Bony fish, in contrast to cartilaginous fish, have swim or gas bladders to control their buoyancy. On the other hand, cartilaginous fish require constant swimming to maintain buoyancy.
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