I need help important test
i need the answers asap
Answer:
Pretty sure the answer is D
Explanation:
terms used to describe factors (or sets of factors) that limit population size include group of answer choices density-dependent and independent limiting factors. extrinsic and intrinsic limiting factors. all of these are correct. environmental resistance.
Terms used to describe factors (or sets of factors) that limit population size include, density-dependent and independent limiting factors, extrinsic and intrinsic limiting factors. So option (d) all of the above is correct.
Limiting elements in the natural environment, such as access to food, water, shelter, and space, can alter animal and plant populations. Populations may also be affected by other limiting factors like as competition for resources, predatory behavior, and sickness.
A population's per capita growth rate changes—typically declines—with rising population density due to density-dependent limiting constraints. One illustration is how individuals of a group compete for scarce food.Independent of population density, certain factors affect per capita growth rate. Natural catastrophes like forest fires are examples.
Diverse limiting variables can interact in intricate ways to produce different patterns of population expansion. Some populations exhibit cyclical oscillations, where the population size varies cycle by cycle in a predictable manner.
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fitness is a measure of reproductive success. if an individual with genotype (bb) produces 6 offspring, and a heterozygous individual (bb) produces 10 offspring, and a third individual with genotype (bb) produces 5 offspring, what is the fitness value for the individual with (bb) genotype?
Reproductive success is measured by physical fitness.Natural selection can affect polygenic traits or qualities determined by different alleles of a single gene.
Is fitness is a measure of reproductive success?
Natural genetic variations among members of the same species are referred to as genetic variation.A population can adapt and survive in the face of shifting environmental conditions thanks to this variety. The fitnesses are just each survival rate divided by the highest survival rate if only survival rates vary and reproduction rates are all identical.Fitness is equal to each reproductive rate divided by the highest reproductive rate if only the reproductive rates vary and the survival rates are all identical. The type of variant present at a specific locus (i.e., region) in the genome is scored by what is known as a genotype.Symbols can be used to symbolize it.For illustration, BB, Bb, and bb could be used to denote a certain gene variant. Even though we are thinking about how selection affects genotypes, we can still compute an allele's average fitness (also known as the marginal fitness) by dividing the likelihood that an allele would occur in a certain genotype by its fitness. The quantity of viable progeny that an organism produces is the best indicator of its fitness.Fitness is a key indicator of reproductive success since it leads to more children, who in turn add more genes to the gene pool for the following generation.Typically, subjects like evolutionary biology will utilize this word. If a dolphin generally gives birth to three young during her lifetime and gives birth to four, she has a greater relative fitness.The absolute fitness of the organism is divided by the typical number of offspring in a population to determine relative fitness.To learn more about reproductive refer
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sean is performing barbell squats with the intent of building up his quadriceps muscles. to make the quadriceps perform more work and increase the efficiency of the exercise, he should:
To make the quadriceps perform more work and increase the efficiency of the exercise, Sean should minimize the amount of trunk flexion at the start of the concentric phase.
We can describe trunk flexion as forward pelvic tilt and flexion of the spine. This activity causes more pressure on the muscles of your quadriceps and hence helps in building them.
The quadriceps can be described as the muscles that are present in the front region of the thigh. These area has more muscle mass as compared to other areas of your brain and hence need to be worked on so that the muscle mass here can be reduced.
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suppose a box of cracker jacks contains one of 5 toy prizes: a small rubber ball, a whistle, a captain america decoder ring, a race car, or a magnifying glass. each prize is equally likely to be in a box. question 1. how many boxes of cracker jacks would you expect to buy until you obtain a complete set of prizes? many human skin tumors contain mutated p53 genes that probably result from excess uv exposure. one of 10 different equally likely mutations of the p53 gene always results from a single episode of excessive uv exposure; the 10 mutations remain equally likely over repeated exposures. a p53 gene must experience all 10 mutations before a tumor can develop. assume that only one mutation can occur as a result of one excessive uv skin exposure. question 2. how many excessive uv exposures would you expect are required until the p53 gene has experienced all 10 mutations?
Most malignancies include somatic TP53 mutations, which range in prevalence from 38%–50% in some cancers (such as ovarian, colorectal, head and neck, throat, and lung) to roughly 5% in others (such as primary leukaemia, sarcoma, testicular cancer, malignant melanoma, and cervical cancer).
What illness exhibits p53 mutations most frequently?The p53 tumour suppressor gene (TP53) is altered in human tumours more frequently than any other gene. Importantly, it is commonly mutated in common human cancers like glioblastomas, as well as less frequently in other serious human cancers including breast and colorectal cancers.
P53 is often altered in solid tumours; in fact, somatic p53 (TP53) gene alterations have been found in more than 50% of all human cancers. Several intracellular processes involved in cell survival, DNA repair, apoptosis, and senescence can be controlled by the transcription factor P53.
P53 inhibition boosts proliferation in healthy cells but slows it down in malignant cells.
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Which phases can line up correctly to cause an eclipse to occur?
A solar eclipse occurs when the Moon comes between the Sun and Earth
What is an eclipse?When the Moon passes between the Sun and Earth, a solar eclipse occurs, emitting a shadow on Earth that either fully or partially blocks the Sun's light in some areas. This only happens sometimes, because the Moon doesn't orbit the same horizontal as the Sun and Earth do. A solar eclipse occurs when the moon gets between Earth and the sun, and the moon sends out a shadow over Earth. A solar eclipse can only happen during the new moon's phase when the moon passes directly between the sun and Earth and its shadows fall upon Earth's surface. Solar eclipses occur only at the new moon phase when the Moon is between Earth and the Sun. throughout a solar eclipse, the Moon casts a shadow on Earth, and blocks or partially blocks our view of the Sun.
So we can conclude that an eclipse of the Moon can only occur at Full Moon.
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after two weeks, the scientists measured the increase in body fat in the mice. they also determined the amount of energy (in kcal/g) in the feces of both groups -- that is, the energy in the food molecules that was not extracted or absorbed by the mice. what experimental results would support the scientists' hypothesis? label the bars on the graphs to match the results predicted by the hypothesis.
Body fat of the lean germ-free mice that received microbes from genetically obese mice increases and their feces contains less energy food will support the scientists' hypothesis.
Since the researchers are determining whether or not microorganisms in the gut community are responsible for obtaining energy from meals, supplying additional calories to the host, and encouraging the development of greater fat deposits, they used obese mice.
Less body fat and more energy food in the feces of the lean germ-free mice that received microbes from genetically lean mice support their claim; that genetics may be a reason while the microbes in the obese mice absorb food, extract energy, and deposit fat in their host. An increase in body fat in the lean germ-free group that received microbes from the genetically obese donors will prove their claim.
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Analyze the graph showing the rate of photosynthesis activity as a function of carbon dioxide level. Select as many of the choices below
that accurately describe the shape of the graph as it relates to photosynthesis.
Rate of photosynthesis
Carbon dioxide
concentration
Carbon dioxide is not needed for the Calvin cycle, so the graph levels off after a certain point
The rate of photosynthesis increases as carbon dioxide levels increase.
In the photosynthesis graph, the rate of photosynthesis increases as carbon dioxide levels rise.
What is photosynthesis ?Photosynthesis is a process that plants and other organisms use to convert light energy into chemical energy that can then be released to fuel the organism's activities via cellular respiration. Photosynthesis is the process by which plants convert sunlight, water, and carbon dioxide into oxygen and sugar energy. Photosynthesis is the conversion of light energy by phototrophs into chemical energy, which is then used to power cellular activities. Sugars, which are formed from water and carbon dioxide, are used to store chemical energy. Photosynthesis occurs within the chloroplasts found in the mesophyll of the leaves.
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as a breeder of purebred dogs, your dogs have been plagued with a recessive genetic defect that is not lethal, but is undesirable. you mate a male to an affected female (she actually has the genetic defect, but is capable of reproducing) and obtain a litter of 8 normal pups (none of the pups exhibit the genetic defect). what should you conclude?
genetic study that sought to tie the behavior of various dog breeds to their ancestry. The percentage of purebred dogs was around 50%, with the other dogs being "mutts." For specific breeds, some of the outcomes were relatively predictable, while many results showed no association.
For instance, Belgian shepherds, Border Collies (a type of herding dog), and Hungarian Viszla dogs shown the highest association between genetics and the capacity for understanding human speech and obeying directions (a trait known as biddability) (a hunting dog). Additionally, owners were asked to provide a list of other habits, and the researchers looked to see whether there were any genetic ties to those behaviors. "Doesn't bury toys" was a resoundingly favorable response, considering only 90% of Greyhounds do this. "Gets caught behind objects" (linked to genes for cognitive ability) and "howling" were the two negative behaviors most frequently mentioned as having a significant genetic component (near a gene involved in speech and language).
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Will marine food sources keep up with human population growth?
Why is there a need to produce okazaki fragments on the lagging strand, but not on the leading strand of dna?.
There is a need to produce Okazaki fragments on the lagging strand, but not on the leading strand of DNA due to the polarity of the strands.
Since new strand synthesis occurs in the 3' to 5' direction,
Okazaki fragments must be produced in the lagging strand during DNA replication. However, only the 5' to 3' orientation can be used by the DNA polymerase to create the strand.
Due to this antagonism, DNA polymerase constantly comes into contact with the strand that was previously created. The synthesis of the new strand occurs in a 5' to 3' direction since the two strands of DNA tend to be anti-parallel, therefore this opposition does not occur in the case of the leading strand.
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What is a trade-off?
a new scientific discovery that benefits the environment
something you sacrifice in order to gain something else
a technological advance that makes life easier
The correct statement is (c) something you sacrifice in order to gain something else.
What is a trade-off ?A trade-off refers to decision making that involves sacrificing or decreasing in quality or quantity of one set of property or ideas in terms of gaining or increasing in another set of property or ideas.
In simple words, a tradeoff is a situational decision of choosing one thing on the cost of another. Sometime it is also called as compromise.
Thus, from above the correct explanation to trade-off is represented by the statement (c) something you sacrifice in order to gain something else.
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pollen tubes multiple choice transport pollen to the stigma. allow sperm to fertilize the egg. are present during spermatogenesis. package sperm into pollen granules. facilitate the growth of pollen.
Pollen tubes allow sperm to fertilize the egg.
A pollen tube is generated from the pollen that extends down its style into the ovule during pollination process of higher plants. Pollen nuclei move down the pollen tube and fertilize the ovule after the pollen germinates upon that stigmatic surface.
Sperm- An ovum (egg cell), which would be produced by the a biologically female body, is the target of a sperm cell, which is intended to be discharged during sexual activity. Once they are joined, the sperm will enter the egg and fertilize it to produce new genetic material. A pollen grain is a microscopic male gametophyte or male plant (gamete-forming plant).
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Labeling the human Skeleton system and labeling nervous system
Completed! Finnnnnnnnn
Female fireflies choose mates based on the specific flash pattern displayed by males flying nearby. This is an example of ________.
Female fireflies choose mates based on the specific flash pattern displayed by males flying nearby, which is an example of behavioral isolation.
What is behavioral isolation?In biology, the term behavioral isolation makes a reference to the reproductive mechanism in which mating is based on the behavior of adult individuals of the species such as in this case female fireflies.
Therefore, with this data, we can see that behavioral isolation is a type of reproductive isolation mechanism based on the behavior of individuals in order to control population numbers depending on the environmental conditions.
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there are no real boundaries for natural systems. explain how this applies to systems in the human body. explain why scientists establish boundaries for natural systems.
Stabilizing boundaries is an idea to relate that humans can keep the resilience and stability of Ecosystem in mind. If these boundaries are crossed, That would effect environment and lead to drastic or inevitable planetary changes.
The planetary boundaries have a negative effect on other planetary boundary because of Earth environment. Example include, if their is a change in climatic condition ecosystem may be badly effected and may cause difficulty in human interference.
It is considered that smaller the system, the sharper is its boundary. Large systems may have multiple boundaries as they interface with multiple systems.
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albinism (the lack of melanin pigmentation) is an autosomal recessive trait. a man and woman both show normal pigmentation but both have one parent who has albinism. they have one daughter who is phenotypically normal. what is the probability that their next child would be an albino girl?
The probability that the next child will show albinism is 0.25.
Albinism is a kind of genetic disorder that occurs in a person. This condition is caused by the lack of a pigment called melanin in a person. The lack of this certain pigment in a person's skin, hair, and eyes leads to lighter color or no color in one's skin, hair, or eyes.
In the given situation, the parents of the child are heterozygous parents.
Hence, since they both have one parent that has albinism, the probability that they will show albinism is 0.25. Since it is a recessive trait in both of them, they might or might not show it. In this case, they didn't, but the marker which carries the trait is still present in both of them. Hence, when they pass it on to their second child, the probability that the second child will show albinism is also 0.25 or 25%
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How would you describe what a shale with ammonite looks like?
Answer: The color-producing shell layer of Ammolite is usually very thin (often less than one millimeter) and attached to a dark gray to brown base of shale or siderite. Exceptional pieces can be cut into gems without stabilization.
Explanation:
The color-producing shell layer of Ammolite is usually very thin (often less than one millimeter) and attached to a dark gray to brown base of shale or siderite. Exceptional pieces can be cut into gems without stabilization.
Ammolite triplet
Most Ammolite is used to produce triplets. These are made by backing the fragile iridescent material with a thin slab for stability and topping it with a transparent cover for protection.
Clear quartz or spinel can be used for the transparent cover. Black shale or another material can be used for the backing. Some Ammolite is made into doublets, which only requires adding a backing or transparent cover as needed. Many stones are impregnated with epoxy for stability.
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chloroplasts move protons from to build a proton gradient group of answer choices the stroma to the cytosol. the intermembrane space to the matrix. the matrix to the stroma. the stroma to the inner thylakoid space. the inner thylakoid space to the stroma.
Chloroplast moves protons from the stroma to the inner Thylakoid space to build a proton gradient.
The chloroplast function is fundamentally dependent on proton gradients. The light-induced -proton gradient is necessary for ATP synthesis across thylakoid membranes.
In the chloroplast stroma, plant photosynthesis generates reduced power. Protons are transported from the stroma into the thylakoid lumen during this process, resulting in the transmission of a proton motive force (pmf) across the thylakoid membrane.
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what does the latent period on a myogram indicate? multiple choice question. the time period between the release of ach and the binding of ach to its receptor the time period between the stimulus and the twitch the time between troponin-tropomyosin conformational change and myosin binding the time period between relaxation and contraction of a myofiber
The latent period on a myogram indicates Option B. is the period of time between the stimulus and the twitch.
A myogram is an image record of the speed and intensity of muscle contractions. A graphical recording of muscle hobby. kinds: EMG, electromyogram. a graphical file of electrical currents associated with muscle contractions. kind of: graph, graphical file.
A myelogram is ready to show your spinal cord, spinal nerves, nerve roots, and bones within the spine by means of injecting evaluation into your spinal fluid. As an end result, it'll additionally display whether or not something is urgent for your spinal cord or nerves.
A Myogram of a Muscle Twitch: A unmarried muscle twitch has a latent period, a contraction segment whilst anxiety will increase, and a relaxation section when anxiety decreases.
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you are given 5 substances: backing material, pzt, matching layer, gel, and skin whose impedances have been measured. unfortunately, the labels identifying each have fallen off. there are five labels, indicating impedances of 0.7 mrayls, 1.0 mrayls, 1.8 mrayls, 1.5 mrayls, 2.0 mrayls. if the backing material is 1.8 mrayls, what are the impedances of the soft tissue, matching layer, gel, and pzt. why?
The impedances of the substances are:
- PZT (2 Mrayls)
- Matching layer (1.6 Mrayls)
- Gel (1.0 Mrayls)
- Skin (0.8 Mrayls)
The active element's impedance is comparable to that of the supporting material. The materials along the way from the PZT to the skin will have decreasing impedances; the PZT will have the highest impedance, followed by the matching layer, gel, and then the skin, to maximize the efficiency of sound energy transfer between the transducer and the body.
Therefore, the impedances of the substances are: PZT (2 Mrayls), Matching layer (1.6 Mrayls), Gel (1.0 Mrayls) and Skin (0.8 Mrayls).
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explain why the delay between muscle stimulation and load movement became longer asthe load became heavier in the experiment. how well did the results compare with yourprediction
The delay in muscle response with heavy load make it longer to heavy weight because as the weight of the load increases, so does the latent period time and the shortening velocity speeds.
When the muscle tension exceeds the load, muscle shortening occurs. The latent period increases as the weight of the load gets heavier, this is for the important force to be activated by the muscle.
If enough myofibrils shorten, the whole muscle fiber slides gets shorter. As more and more muscle fibers contract with each other, they shorten the entire muscle by changing the attachment points at the two ends of the muscle toward each other.
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most aec consoles permit activation of a. all three cells simultaneously. b. all three cells in any combination. c. the outer cells when the center cell is inactivated. d. the center cell and either outer cell.
Most AEC (Automatic Exposure Control) consoles permit activation of (b) all three cells in any combination.
An Automatic Exposure Control (AEC) console is a tool that is found on most of the advanced radiographic units. It helps the radiographer in ascertaining the radiation exposure (in terms of quantity) in order to create a quality image.
An AEC console is deployed to regulate invariably the quantity of radiation approaching the image receptors by terminating the length of exposure. Automatic Exposure Control (AEC) consoles are also known as automatic exposure devices. These consoles are exceptionally good at producing persistent levels of exposure if utilized accordingly.
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(30)Can an organism with a homozygous dominant genotype have an offspring with the recessive phenotype? Explain your answer
(in depth explanation pls ;-;)
No, an organism with a homozygous dominant genotype cannot have an offspring with the recessive phenotype because when crossed with hetero/ homozygous , the offspring will contain a dominant allele.
What is a genotype?An individual's genotype, often known as their genetic make-up, refers to the genes that are responsible for a set of characteristics or qualities that are manifested in that individual.
The phenotype is the outward manifestation of how a gene is expressed. The phenotype is the sum total of all the genes in an individual that are either expressed or can be observed in their physical form.
It is only possible for the phenotype associated with recessive alleles to be expressed in an organism if that organism possesses two copies of the recessive allele, making it homozygous for the recessive allele. This indicates that the genotype of an organism that possesses a dominant phenotype might either be homozygous for the dominant allele or heterozygous for the dominant allele.
Therefore, an organism with a homozygous dominant genotype cannot have an offspring with the recessive phenotype.
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what characterizes all ecdysozoans? ecdysozoans reproduce clonally (asexually). ecdysozoans grow by molting. ecdysozoans are sessile (don't move) in the adult stage. ecdysozoans practice suspension feeding.
All ecdysozoans grow by molting. This characteristic applies to all ecdysozoans.
The epidermis then secretes a new exoskeleton, which is soft until the remnants of the old cuticle that was laying on top are shed during ecdysis. The fresh cuticle then grows and becomes harder. Only because ecdysozoans are adept at molting does this procedure in nature appear to be straightforward.
What are some features of ecdysozoans?
Ecdysozoans are most known for their cuticle, a thick yet flexible exoskeleton that shields these creatures from predators, water loss, and other elements of their environment. As they develop, every member of this superphylum molts or sheds its cuticle on occasion.
Therefore, All ecdysozoans grow by molting.
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In roses assume that red or yellow flower color is controlled by a single gene with two alleles. Crossing roses with yellow flowers with each other yields only offspring that produce yellow flowers, but when you cross roses with red flowers with each other you sometimes get offspring that produce yellow flowers. If you take a rose plant that is heterozygous for the flower color gene and cross it with another rose plant with red flowers that has had yellow-flowered offspring in the past, what are the predicted fractions for the possible phenotypes of the offspring?.
The predicted fractions for the possible phenotypes of the offspring are 3/4 red and 1/4 yellow.
The genotypes of the offspring of this hybrid can be used to predict the proportions of phenotypes. Offspring with either the PP or Pp gene will have the red-flower phenotype because P is dominant to p.
The yellow-flower phenotype can only be inherited through the pp genotype. As a result, with this cross, you would anticipate that three of the four (75%) progeny will have red flowers and one of the four (25%) would have yellow flowers. Mendel obtained the same percentages in his initial experiment.
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the percentage of homozygous recessive individuals (for one particular trait) in a population is found to be 64%. assuming the population is at hardy-weinberg equilibrium, what is the proportion of the homozygous dominant genotype? (give your answer as a decimal between 0-1)
The percentage of the homozygous dominant genotype is 0.04 or 4%
An important fundamental principle of population genetics is the Hardy-Weinberg Equilibrium (HWE), which states that "genotype frequencies in a population remain constant between generations in the absence of disturbance by external factors."
if, [tex]p^{2}[/tex] = 64% = 0.64
Therefore, the percentage of the recessive allele in the population,
q = 0.8
Since, p + q = 1, the percentage of the dominant allele in the population, p = 0.2
Now, the percentage of homozygous dominant genotype in the population,[tex]p^{2}[/tex] = [tex](0.2)^{2}[/tex] = 0.04 or 4%
the percentage of heterozygous genotype, 2pq = 2(0.8)(0.2) = 0.32 or 32%
(complete question)
The percentage of homozygous recessive individuals (for one particular trait) in a population is found to be 64%. Assuming the population is at Hardy Weinberg equilibrium, what is the proportion of the heterozygous genotype? (give your answer as a decimal between 0-1)
p+q=1(p= freq. of dominant allele, q= freq. of recessive allele)
[tex]p^{2}[/tex] +2pq+ [tex]q^{2}[/tex] =1
( [tex]p^{2}[/tex]= proportion of homozygous dominant genotypes,
2pq = proportion of heterozygous genotypes,
[tex]q^{2}[/tex]=proportion
of homozygous recessive genotypes)
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When considering different hypotheses, usually the
_______ one which can account for the
________ is the correct one.
Answer:
simplest, information
The diploid number of chromosomes for human skin cells is 46. If the cells undergo mitosis, what will be the diploid number of chromosomes in the new skin cells?.
Answer:
23 perhaps
Explanation:
not too sure..
Answer:
46
Explanation:
they stay the same
do all human cells obtain glucose in the same way 
Answer:
Animal cells (including humans ofcourse), heterotrophs, derive their energy from coupled oxidation-reduction reactions. Glucose is a primary fuel for heterotrophs. Energy derived from glucose is stored in the form of high-energy phosphate bonds in ATP, or other nucleotide triphosphates, and as energy-rich hydrogen atoms associated with the co-enzymes NADP and NAD .
Glucose is unable to diffuse across the cell membrane without the assistance of transporter proteins. At least 13 hexose transporter proteins with different functions have been identified. Some hexose transporters allow glucose to flow passively from high to low concentration without requiring the expenditure of cell energy. Those that move glucose against its concentration gradient consume energy, generally in the form of ATP.
D-Glucose is the natural form used by animal cells.
So yes it is present inside human cells .
