Answer:
Polymerase chain reaction, or PCR, is a technique to make many copies of a specific DNA region in vitro (in a test tube rather than an organism).
Which statement best describes the role of DNA ? It transmits genetic information to the next generation. It speeds up chemical reactions inside of cells. It directly forms proteins. It provides a form of energy for cells.
Answer:
It transmits genetic information to the next generation
Explanation:
DNA stores information on how the cell should be made and ‘run’. This is why it is critical that its integrity is well preserved. Otherwise, mutations on DNA can be lethal to the cell. In higher cells, DNA is protected in the nucleolus. To pass down the genetic information, DNA is replicated by DNA polymerases and then during cell division, either copy of the pair goes to each of the two daughter cells.
Answer:
transmits genetic info to next gen
Explanation:
taking the test
Seeds that desiccate and become quiescent are known as ________ seed while those that hydrated at the time of seed shed and are unable to withstand desiccation are known as ______________ seed. quilzewt
Answer:
orthodox; unorthodox
Explanation:
Orthodox seeds are the seeds which are long-lived and can be successfully dried to the moisture contents as low as 5% without the injury and are able to tolerate the freezing. They are therefore, also called as the desiccation tolerant seeds.
On the other hand, unorthodox seeds are short-lived and thus, cannot be dried to the moisture content which is below 20-30% without the injury and are also unable to tolerate the freezing. They are therefore, also called as desiccation sensitive seeds. The seeds are very difficult to be stored and also the ex-situ conservation of them is problematic.
_____ recognized the vital role of the internal environment and suggested that the objective of mechanisms within the body is to preserve the constant conditions of the internal environment.A) Carolus LinnaeusB) Claude BernardC) Schwann and SchleidenD) Robert Hook
Answer:
The correct answer will be option-B.
Explanation:
Claude Bernard was a French physiologist who is known for his concept of homeostasis.
He made many discoveries in the field of medicine and provided a new concept called Milieu intérieur which was associated with the stability of the internal environment of the organisms which was later termed "Homeostasis" by Walter Bradford Cannon.
He explained the importance of the "internal environment" of the organism and showed that the living organism does not totally rely on the external environment.
Thus, option- B is the correct answer.
1. An amoeba with 26% salt concentration is placed in a beaker of water with 55% salt concentration. What will happen to the amoeba
2. An animal cell with a 35% glucose solution is placed in distilled water. What will happen to the cell?
Answer:
it will dey in the whom
Explanation:
Final answer:
An amoeba with lower salt concentration placed in a higher salt concentration solution will lose water and shrink (crenate), while an animal cell placed in distilled water will gain water and potentially burst (hemolyze).
Explanation:
The questions relate to the principle of osmosis, which is the movement of water across a semi-permeable membrane from an area of lower solute concentration to an area of higher solute concentration. When an amoeba with a 26% salt concentration is placed in a 55% salt concentration solution, water will move out of the amoeba into the surrounding solution, causing the amoeba to shrink, a process known as crenation.
In the second case, if an animal cell with a 35% glucose solution is placed in distilled water, which is a hypotonic solution (meaning it has a lower concentration of solutes than the cell's internal environment), water will enter the cell. This will cause the cell to swell and potentially burst in a process called hemolysis.
Describing the relative concentrations of solutes in and out of cells helps us predict the direction of osmosis. Cells in a hypotonic solution typically swell due to the influx of water, whereas cells in a hypertonic solution shrink due to the efflux of water.
Knowing what we know about the link between genetics, environment and intelligence, what would be your expectations if you were a teacher and you had a pair of monozygotic twins in your classroom
Answer:
I would expect them to perform similar.
Explanation:
Studies suggest that intelligence has a genetic component and can, in part, be passed from parent to child - but not only that. There are outer components that contribute to the formation of intelligent individuals. Better nutrition and more access to education would be possible explanations for the progressive increase in intelligence test scores over time.
Homozygous twins are those that are mainly characterized by similarity between individuals. These twins are formed from the same zygote, ie after the fertilization process. Because of this characteristic, they have the same genetic heritage and are therefore considered identical.
As the homozygous twins in their classroom have the same genetic heritage and attend the same environment, we can conclude that their intelligence is influenced by the same factors. For this reason, a teacher who taught these two brothers might have expectations that they would perform similarly in the classroom.
Monozygotic twins' intelligence is influenced by both genetics and environment.
Explanation:There is evidence that both genetics and environment play a role in intelligence. When it comes to monozygotic twins (twins that share 100% of their genetic material), their intelligence is influenced by both their shared genetics and their shared environment. Twins raised together in the same home tend to have more similar IQs than twins raised in different homes. This suggests that the nurturing environment they share has an impact on their intelligence.
A ciliated version of pseudostratified columnar epithelium containing mucus-secreting goblet cells ________. ANSWER : - is more durable than all other epithelia -aids in digestionlines most of the respiratory tract -is found in some of the larger glands
The study of the cell is called cell biology. There are two types of cells on the basis of the number and these are unicellular and multicellular.
The correct answer is “lines most of the respiratory tract”.
What is epithelium?The epithelium is a type of body tissue that forms the covering on all internal and external surfaces of your body, lines body cavities and hollow organs, and is the major tissue in glandsRespiratory epithelium is characterized by ciliated pseudostratified epithelium containing goblet cells.
The goblet cells secrete mucous which helps trap pathogens in the respiratory tract. The wave motion of the cilia help moved the trapped pathogens out of the respiratory tract to be coughed out or swallowed.
Hence, the correct answer is the respiratory tract.
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Which of the following statements about lysosomes is false?
a. Lysosomes help to digest worn-out or damaged organelles.
b. Lysosomes synthesize proteins from the recycled amino acids.
c. Lysosomes fuse with food vacuoles to expose nutrients to lysosomal enzymes.
d. Lysosomes destroy harmful bacteria engulfed by white blood cells.
Answer:
The correct answer is option b. "Lysosomes synthesize proteins from the recycled amino acids".
Explanation:
Lysosomes are organelles of eukaryotic cells which main function is the digestion and removal of waste by the action of degradative enzymes. Is false to affirm that lysosomes synthesize proteins from the recycled amino acids, on the contrary, lysosome function is to degrade proteins not synthesize them.
The false statement about lysosomes is that they synthesize proteins from the recycled amino acids. Lysosomes are involved in digestion and disposal of cellular waste and harmful bacteria but protein synthesis is not a function of lysosomes.
Explanation:Among the statements provided, the one that is false is: b. Lysosomes synthesize proteins from the recycled amino acids. Lysosomes are cellular organelles that are primarily involved in the digestion and disposal of cellular waste products, worn-out organelles, and harmful bacteria. However, the synthesis of proteins is not a function of lysosomes, this process is carried out by the ribosomes in the cell.
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Boreal owls range over a much larger area than do other owls of similar size. The reason for this behavior is probably that the small mammals on which owls feed are especially scarce in the forests where boreal owls live, and the relative scarcity of prey requires the owls to range more extensively to find sufficient food.
Which of the following ,if true, most helps to confirm the explanation above?(A) Some boreal owls range over an area eight times larger than the area over which any other owl of similar size ranges.(B) Boreal owls range over larger areas in regions where food of the sort eaten by small mammals is sparse than they do in regions where such food is abundant(C) After their young hatch, boreal owls must hunt more often than before in order to feed both themselves and their newly hatched young.(D) Sometimes individual boreal owls hunt near a single location for many weeks at a time and do not range rather than a few hundred yards.(E) The boreal owl requires less food, relative to its weight, than is required by members of other owl species.
Answer:
(B) Boreal owls range over larger areas in regions where food of the sort eaten by small mammals is sparse than they do in regions where such food is abundant
Explanation:
Living beings exhibit various changes in the behavior and niche to make themselves better fitted to the conditions of their habitats.
Boreal owls feed on the other smaller mammals such as mice and shrews. These organisms that serve as their prey are relatively less abundant in the habitat. To ensure the food availability, the boreal owls occupy a larger area so that they can catch their less abundant food organisms.
In the habitats where the prey species of boreal owls are present in a larger number, these owls occupy smaller regions since the food organisms are easily available.
"The correct answer is (B) Boreal owls range over larger areas in regions where food of the sort eaten by small mammals is sparse than they do in regions where such food is abundant.
This answer choice most helps to confirm the explanation provided in the question because it directly supports the hypothesis that boreal owls range over a larger area due to the scarcity of their prey. If boreal owls are observed to increase their hunting range in areas where the food supply for small mammals (their prey) is low, it suggests a causal relationship between prey scarcity and the owls' ranging behavior. This observation would strengthen the argument that the relative scarcity of prey is indeed the reason why boreal owls cover a larger area compared to other owls of similar size.
Let's consider the other options:
(A) Some boreal owls range over an area eight times larger than the area over which any other owl of similar size ranges. - While this statement indicates that boreal owls range over a larger area, it does not provide information about the relationship between prey scarcity and ranging behavior.
(C) After their young hatch, boreal owls must hunt more often than before in order to feed both themselves and their newly hatched young. - This statement explains a change in hunting frequency due to the needs of their offspring, but it does not specifically link this behavior to the scarcity of prey.
(D) Sometimes individual boreal owls hunt near a single location for many weeks at a time and do not range rather than a few hundred yards. - This statement actually contradicts the explanation by suggesting that boreal owls sometimes do not range extensively, which would weaken the argument.
(E) The boreal owl requires less food, relative to its weight, than is required by members of other owl species. - This statement suggests that boreal owls might need less food, which could imply that they do not need to range as far. It does not support the explanation that they range more extensively due to prey scarcity.
Therefore, option (B) is the most supportive evidence for the explanation given for the ranging behavior of boreal owls."
Sensory and motor tracts within the spinal cord
a. are separated into sensory tracts on the right and motor tracts on the left side of the spinal cord
b. have names that indicate the location of the initiation and termination of the nerve impulses
c. they conduct are located in the gray matter
d. all of these choices are correct
Answer:
b. have names that indicate the location of the initiation and termination of the nerve impulses
Explanation:
The sensory and motor tracts are sets of nerve fibers that run inside the central nervous system; more precisely within the spinal cord and they are named according to the path their fibers have, that is, we will call them indicating from where they begin to where they arrive.
For example, the spinothalamic tract is a sensory tract that carries the sense of touch and pressure from the spinal cord to the thalamus.
On the other hand, corticospinal tracts are linked to isolated and specialized voluntary movements (especially from the distal part of the limbs) and descend from the cerebral cortex to the spinal cord.
As for the other options, I can say that they are incorrect because the tracts do not differ to the right and left of the cord in sensory and motor. Also, the tracts are located in the white substance not in the gray.
Sensory and motor tracts are both present in the spinal cord but are not segmented by the sides. These tracts are named for their initiation and termination points, and are found in the spinal cord's white matter, not the grey.
Explanation:In the spinal cord, both sensory and motor tracts coexist, providing a pathway for nerve signals. Contrary to option a, they are not separated into sensory tracts on the right and motor tracts on the left. Instead, sensory tracts carry signals from peripheral body parts to the brain while motor tracts transmit signals from the brain to the muscles or glands. Option b is correct, as these tracts are often named based on their point of origin and endpoint. On the other hand, the tracts are found in the white matter of the spinal cord, not the grey matter as option c suggests. Thus, not all options provided are correct.
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Need help please!
Mars was once similar to Earth in that
A. it had only one moon.
B. liquid water flowed on its surface.
C. it showed evidence of plate tectonics.
D. its atmosphere had a thin layer of carbon dioxide.
Answer:
B. Liquid water flowed on its surface
Answer:
B. Liquid water flowed on its surface.
Explanation:
We see evidence nowadays that Mars once had flowing water on its outer crust/surface. But due to temperature and different climate changes, the water changed into ice, and some of this water evaporated to space. Hope this helps!
Measuring the height of a plant is an example of _____ data
Qualitative
Experimental
Quantitative
Measuring the height of a plant is an example of quantitative data
Answer: Option C
Explanation:
When there is an experiment performed there are 2 types of data that can be recorded one is a qualitative data and quantitative data. Qualitative data is a type of data that describes the quality of the product formed whereas the quantitative data is a data that quantitative the numerical values that we get through the experiment. A quantitative data is more authentic than a qualitative data as it provides figures for comparison.
A defect in the absorption of certain nutrients in the small intestine has been linked to an abnormally-delayed initiation of differentiation. If the levels of HER2, PTEN, and Akt protein can be estimated accurately, what is the earliest point in development at which the defect could be evaluated?
The earliest point to evaluate the defect is during the 6th to 8th week of embryonic development, when small intestinal differentiation normally begins.
The defect in nutrient absorption related to delayed differentiation could be evaluated during early embryonic development, particularly during the formation of the small intestine. The small intestine arises from the endoderm around the 4th to 5th week of human embryogenesis.
HER2, PTEN, and Akt are key regulators in cellular proliferation, survival, and differentiation, often influencing the PI3K/Akt signaling pathway, which controls various developmental processes, including cell growth and differentiation.
So, monitoring levels of these proteins around the time when the small intestinal epithelium begins to differentiate—around the 6th to 8th week—could provide an indication of any delays in initiation of differentiation.
A certain amount of fiber in foods contributes to the health of the digestive system. However, eating too much fiber leads to nutrient losses. The characteristic of diet planning illustrated by this statement is called _____.
Answer:
moderation
Explanation:
According to my research on various studies conducted by nutritionists, I can say that based on the information provided within the question the characteristic of diet planning illustrated by this statement is called moderation. This is the act of controlling how much of a substance is consumed in order to maximize or minimize it's effects.
I hope this answered your question. If you have any more questions feel free to ask away at Brainly.
Phylogenetic trees can be most accurately constructed using A. DNA B. Traits in common between organisms due to homology C. Linnaean classification D. combination of DNA and traits in common between organisms due to homology E. combination of Linnaean classification and DNA
Answer: Option A
Explanation:
A phylogenetic tree is an imaginary diagram which is used to represent the evolutionary relationship among organism.
It is a form of hypothesis not a definite fact, that the branching of trees reflect how the organism have evolved from the common ancestors.
It shows how two organisms are related to one another and it shows that two organism that have similar characters share more recent common ancestors.
Answer:
E) Combination of Linnean classification and DNA
Explanation:
The Linnean classification gives us a map and a orientation on where to go in the branches of families. The DNA give us the relationships between relatives
Correctly order the steps involved in cellular immunity:
a) The Tc recognizes the infected host cell
b) The Tc interacts with epitope presented by MHC-I on the dendritic cell
c) The Tc secretes perforin and granzyme, causing apoptosis
d) The helper T cell activates the Tc cell
Answer: A, B, C, D
Explanation: 1. The Tc recognizes the infected host cell
2. The Tc interacts with epitope presented by MHC-I on the dendritic cell
3. The Tc secretes perforin and granzyme, causing apoptosis
4. The helper T cell activates the Tc cell
Cell-mediated immunity is mediated by T lymphocytes. They originate in the bone marrow and mature in the thymus. T cell interact with other cells via its T cell receptor. (TCR). It can only interact with antigenic peptides bound to the Class I MHC molecules on the surface of antigen presenting cells. (APC).
When a TCR of a naïve T cell interacts with and antigen which presents the Class I MHC molecules it gets activated and undergoes differentiation and proliferation which is also known as clonal selection.
There exist two types of T cells
1. Effector or Helper T cells
2. Memory T cells
Cell-mediated responses has both innate and specific immune components. Among the common innate components is the antigen-presenting cell (APC), which interacts with T helper cells to initiate the immune response. After the recognition of the antigen takes places the Tc interacts with epitope presented by MHC-I on the dendritic cell
In addition to granzymes and perforin, T cells are able to produce granulyson and lymphotoxin.
The correct order of steps involved in cellular immunity is as follows:
The dendritic cell phagocytoses the pathogen and processes it.The dendritic cell presents pathogen-derived antigens on its surface using MHC class I molecules.The infected host cell is recognized by the cytotoxic T cell (Tc).The Tc interacts with the epitope presented by MHC-I on the dendritic cell.The helper T cell (Th) recognizes the same antigen presented by the dendritic cell.The activated helper T cell secretes cytokines that activate the Tc cell.Cellular immunity, also known as cell-mediated immunity, is a branch of the immune system that involves the activation and response of specific immune cells to defend the body against pathogens, such as viruses, bacteria, fungi, and parasites. It is one of the two major components of the adaptive immune system, along with humoral immunity.
Cellular immunity primarily relies on the action of specialized white blood cells called lymphocytes. The main types of lymphocytes involved in cellular immunity are T cells (or T lymphocytes) and natural killer (NK) cells.
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Which of the following is NOT a component of the Theory of Evolution by Natural Selection? a. competition for food and space b. variation among species c. inheritance of acquired characteristics d. survival and reproduction
Answer: c. inheritance of acquired characteristics.
Explanation:
The inheritance of acquired characteristics is a part of Lamarck's theory of evolution. He states that organisms can pass through their genes characteristics that they have acquired in their lifetime to their offspring.
For example, if a giraffe is born with a short neck, and it lenghtens after years of trying to reach the higher leaves of a tree, Lamarck stated that its calves (its babies) would be born with a long neck.
Darwin, publisher of the first Natural Selection theory, said that, by a slight random mutation of the genes, the giraffe with the longer neck would already be born with the long neck. It would be more successful when finding leaves to eat, and therefore produce more offspring with its DNA than the ones with a short neck. As a result, the number of long necked giraffes would grow, and eventually the short necked ones would go extinct.
Inheritance of acquired characteristics ( C ) is not a component of the Theory of Evolution by Natural selection
Evolution by Natural selection involves competition for food and habitat within an ecosystem, the variation seen among species are existent due the factors of natural selection which makes some species become more adaptive to the ecosystem than others.
The ability to reproduce and survive within an ecosystem is a major factor determined the natural selection as well. While inheritance of acquired characteristics is part of Lamarck's theory of evolution which states that parents can pass on acquired characteristics to offspring and this disputes the theory of evolution by Natural selection.
Hence we can conclude that Inheritance of acquired characteristics is not a component of the Theory of Evolution by Natural selection.
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QUESTION 6
A weak base ______ in solution
A)dissociates completely
B)does not dissociate completely
C)does not dissociate
D)none of these
Answer:
does not dissociate completely
Explanation:
does not dissociate completely. Strong base dissociates completely, weak base only does it partially and it is according to its Kb (equilibrium constant)
The weak base B) does not dissociate completely.
Explanation:Bases are the substance which produces [tex]\bold{OH^-}[/tex] ions when dissolved in aqueous solution or when they are treated with water. The pH of bases remains above 7. They react with salt and cause neutralization a process through which salts are formed.
Based upon the dissociation rate, they are classified as strong base or week base. The base which gets completely dissolved in aqueous solution or water, it is called as strong base, whereas the base which gets partially dissociates or does not dissociate completely when treated with water or aqueous solution are called weak base.
One pathway that produces ATP starts with glucose. When glucose enters a cell, it is broken down via successive steps. Along the way, some ATP is produced directly. With regard to the breakdown of glucose, this is an example of__________ pathways.
Answer:
catabolic pathways.
Explanation:
The degradation of complex substances into simpler ones are catabolic processes. They release the energy stored in their bonds and are able to transfer the energy to the adenosine triphosphate (ATP) molecule.
The breakdown of glucose involves a lot of successive steps releasing all the energy contained in their bonds.
It is a clear example of a catabolic pathway.
Avery, MacLeod, and McCarty performed an experiment to narrow down what type of molecule the transforming factor is. They added enzymes to the heat-killed S strain to target different types of molecules in each test. If they had then injected the different mixtures into mice, what would the results have been?
Answer:
Different from the one is expected
Explanation:
Even mice are mammals like us, but they have different characteristics, so in this way, they the codification and the effects of the molecule, in mice will be different as in humankind. The enzymes could be different in these species, or also the codification proteins.
In 1944, Avery, MacLeod, and McCarty performed experiments treating the heat-killed S strain with different enzymes to identify the transforming principle. They found that only when DNA was destroyed did the R strain not transform, indicating that DNA was the genetic material responsible for hereditary traits.
Explanation:Avery, MacLeod, and McCarty's Transforming Principle Experiment
In 1944, Oswald Avery, Colin MacLeod, and Maclyn McCarty sought to further understand the nature of Griffith's transforming principle. They hypothesized that the transforming factor responsible for endowing bacteria with new properties was either protein, RNA, or DNA. To test this, they treated the heat-killed S strain with enzymes that would degrade each type of molecule separately and observed the subsequent transformation of the R strain of bacteria.
They discovered that when DNA was degraded by the enzyme, the ability of the extract to transform the R strain was lost. The remaining enzymes which targeted proteins and RNA did not inhibit transformation, thus indicating that DNA is the transforming principle. If they had injected these different mixtures into mice, it is expected that only the mixtures where DNA was not destroyed would result in the transformation of the R strain into the virulent S strain, inherently proving that DNA is the genetic material responsible for this transformation.
Some orchids grow high on trees so that they can get enough light for photosynthesis. The trees are unaffected by the presence of the orchids. The relationship between the orchids and the trees is an example of __________.
Answer: Commensalism (Symbiotic relationship)
Explanation:
Commensalism is a type of symbiotic relationship in which one species gets benefits while the other species remain unaffected.
Orchids are epiphytes which grows on the inner branches of trees of rainforest that helps in taking nutrients directly from the air around them and sometimes from the decaying organic matter of their host tree. Epiphytic orchids stores water in their stems and compensate in dry periods. Trees having rough barks that holds humus and water in it's crack supports orchids better than other trees with smooth barks.
A researcher studied two groups of fruit flies
Population A was kept in a 0.5 L container
Population B was kept in a 1 L container
3. The independent variable in the controlled experiment was the
a. number of flies
b. number of groups studied
c. number of days
d. size of the containers
Answer:
D
Explanation:
An independent variable is variable in an experiment that is not affected by another variable and is often used to influence the other variables, which are dependent variables. In this case the size of the container is the independent variable because its changes affect the behavior of the fruit flies. The behavior of the fruit flies is the dependent variable. The number of flies, that is kept constant, is the controlled variable.
What usually happens to the accuracy of an estimate of population size as the number of fish caught increases? A. The estimate is usually more accurate. B. The estimate is usually less accurate. C. The accuracy of the estimate will not change. D. The estimate is most accurate when the number of fish caught is 50% of the total population.
Answer:
You would expect the accuracy to increase as you caught more fish since you are getting a bigger more precise population sample.
Your answer is A
Answer:
A. The estimate is usually more accurate.
Explanation:
When you are dealing with statistics the larger the sample you are taking, the most accurate and closer to the real population you get, in this case if you keep catching fishes to make samples from, you can get a more accurate estimate of the characteristics of the population. The least samples you take, the further from the actual population you get.
Since bacillus megaterium are non-motile, they may not be able to avoid harmful toxins in the environment.
b. megaterium is known to have endospores; why would endospore formation be advantageous for this bacterium? choose the best answer(s).
Answer:
B, C, & D
Explanation:
Just like any other organism, bacteria too also need to survive in their environment. When the environment become unfavorable for growth and development, they shift from a vegetative state to a dormant state. They do this through formation of endospores that are highly resistant to extreme stress. This is especially significant for bacteria that have no motility. Bacteria that have flagella can move into a new environment.
Final answer:
Endospore formation is crucial for Bacillus megaterium, providing a survival mechanism against extreme conditions. These endospores ensure the bacterium's durability through periods of high temperature, chemicals, and nutrient deprivation, enabling it to survive and later thrive once conditions improve.
Explanation:
Endospore formation is highly advantageous for Bacillus megaterium, despite being non-motile and unable to avoid harmful toxins. These endospores enable the bacterium to survive extreme environmental conditions that are not conducive to its vegetative state. Since B. megaterium can encounter such conditions due to its non-motile nature, having a mechanism to enter a dormant state ensures its species’ survival over long periods. This includes resistance to high temperatures, chemicals, and even lack of nutrients.
Endospores are essentially a survival mechanism, allowing B. megaterium to withstand unfavorable conditions until the environment becomes conducive for growth again. These endospores are incredibly resistant, capable of surviving for millions of years and bringing the bacterium back to life under the right conditions. Furthermore, their ability to resist antibiotics and most disinfectants adds another layer of survivability against attempts to eradicate them in clinical settings.
Given this context, the formation of endospores is crucial for B. megaterium to persist through periods of environmental stress, thereby ensuring the continuity of their species even when immediate growth conditions are not available. This capability is particularly valuable considering the harmful toxins and adverse conditions the bacteria may encounter due to its lack of mobility.
One of the hormones is GIP (glucose-dependent insulin trophic peptide), which stimulates the secretion of insulin. It is secreted by cells of the duodenum in response to the presence of glucose. Its secretion and action on insulin production is an example of a:a. homeostatic positive feedback mechanism amplifying the response to glucose ingestion.b. homeostatic negative feedback mechanism, keeping a system near a set point.c. homeostatic negative feedback mechanism changing the set point.d. this response is not homeostatic.
Answer:
The correct answer is option- b. homeostatic negative feedback mechanism, keeping a system near a set point.
Explanation:
Homeostasis is a resistance system of the body that balances the body according to the change to maintain equilibrium in the system or body. It can take place with negative or positive feedback.
The negative feedback mechanism is the action that opposes to cue or stimulus presented by the system. For example, GIP is the hormones that help in the increase in insulin release and suppress the release of glucagon. It also prevents the blood sugar hike by slow emptying of gastric.
Thus, the correct answer is - B. homeostatic negative feedback mechanism, keeping a system near a set point.
if fossil fuels are constantly being formed why is it important for humans to find alternate sources of energy?
Answer:
Fossil Fuels Take Millions of Years to FormExplanation:
The fossil fuels that we are using today were created way back when dinosaurs still roamed the earth. Fossil are constantly being replenished. However, they take a very long time to form. They form way too slowly to replenish at the rate that we are using them. Also, even if they did replenish, they have so badly polluted our planet to the point where many species hang in the balance that it is paramount to find alternate sources of energy before the planet is destroyed to the point where it can no longer sustain life.
PLEASE MARK BRAINLIEST
_______ labs, are suitable for work involving agents not known to cause disease in adult humans. This lab presents minimal potential hazard to lab personnel and the environment.
Answer:
Biosafety level 1 labs.
Explanation:
Biosafety level labs are used for the the isolation of the harmful antigens nder the required set of conditions. Different types of biosafety level labs are Biosafety level 1, Biosafety level 2 and Biosafety level 3.
The Biosafety level 1 labs (BSL 1) labs are used for the well characterization agents that are not able to cause disease in humans. The lab prevent the individual from the potential hazard and also prevent the environment. The special equipments are used in the BSL1.
Thus, the answer is biosafety level 1 labs.
Unattached earlobes are dominant to attached earlobes. Cleft chin is dominant to no cleft. Parents that are heterozygous for both traits are crossed. Determine the ratios of offspring with: Unattached earlobes and cleft chin : Unattached earlobes and no cleft : Attached earlobes and cleft chin : Attached earlobes and no cleft :
Answer:
Unattached earlobes and cleft chin : 9
Unattached earlobes and no cleft : 3
Attached earlobes and cleft chin : 3
Attached earlobes and no cleft :1
Explanation:
Given -
Unattached earlobes are dominant to attached earlobes
Let the allele for attached ear lobe be represented by "l" and and unattached ear lobe be represented by "L"
Cleft chin is dominant to no cleft.
Let the allele for cleft chin be represented by "C" and no cleft chin be represented by "c"
Genotype of heterozygous parents
LlCc X LlCc
LC Lc lC lc
LC LLCC LlCc LlCC LlCc
Lc LLCc LLcc LlCc Llcc
lC LlCC LlCc llCC llCc
lc LlCc Llcc llCc llcc
LLCC - 1
LlCc – 5
LlCC-2
LLCc – 1
LLcc-1
Llcc -2
llCC-3
llcc-1
Unattached earlobes and cleft chin : 9
Unattached earlobes and no cleft : 3
Attached earlobes and cleft chin : 3
Attached earlobes and no cleft :1
Answer:
This should help.
Explanation:
What is another important difference between mitosis and meiosis?
A. Mitosis can only occur in cells that are diploid (or have higher ploidy).
B. Meiosis can only occur in cells that are diploid (or have higher ploidy).
C. Mitosis can occur in haploid as well as diploid cells.
D. Both B and C above are important differences.
E. None of the above describes a difference between mitosis and meiosis.
Answer:
d.both b and c
Explanation:
meiosis can occur in diploid cells because the chromosomes duplicate once, and through two successive divisions, four haploid cells are produced, each with half the chromosome number of the parental cell and also Meiosis occurs only in sexually reproducing organisms.
Mitosis is not restricted to diploid cells.Because Mitosis means Equational division i. e the number of chromosome will remain same after division. So it can occur in both diploid as well as in haploid cells.
which of the following characteristics is shared by all organisms?
A. all organisms are composed of two cells
B. all organisms can smell and taste
C. all organisms have cells that contain DNA
All organisms have cells that contain DNA is the characteristic shared by all organisms.
Deoxyribonucleic acid (DNA) is a molecule present in all living beings contains the genetic information that living beings use to function, acting as a guide with the instructions for the construction of the rest of the components of cells.
DNA is a biopolymer that houses the data for the synthesis of proteins and that makes up the genetic material that cells have.
This nucleic acid also enables data to be transmitted through inheritance.
Its "units" are called bases and are made up of four main molecules: adenosine, thymidine, guanidine, and cytosine.
With specific combinations of these four units, all the specific proteins of each life form are encoded in DNA.
Therefore, we can conclude that DNA is the most important molecule present in all living beings since it is the one that stores hereditary information and also the information for the correct functioning of all living organisms.
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Question 6
A weak base ______ in solution.
A)dissociates completely
B)does not dissociate completely
C)does not dissociate
D)none of these
Answer:
a
Explanation:
its th eopposite of acid and a weak acid will not dissociate
hope this helps :)
The weak base B) does not dissociate completely.
Explanation:Bases are the substance which produces [tex]OH^-[/tex] ions when dissolved in aqueous solution or when they are treated with water. The pH of bases remains above 7. They react with salt and cause neutralization a process through which salts are formed.
Based upon the dissociation rate, they are classified as strong base or week base. The base which gets completely dissolved in aqueous solution or water, it is called as strong base, whereas the base which gets partially dissociates or does not dissociate completely when treated with water or aqueous solution are called weak base.