When a sea star loses an arm, the separated limb can grown into a new sea
star. What processes make this possible?

The term for the part of a DNA strand that produces a protein that causes a stem cell to differentiate is differentiation-inducing factor or  differentiation signal.

This protein is a transcription factor that regulates the expression of genes involved in cell differentiation, leading to development of specialized cell types.

Cell fate means that stem cell makes a decision to differentiate into mature cell type. Signals from environment—chemicals, extracellular proteins/hormones/factors, neighboring cells, physical environment—converge on the cell, activating a signaling cascade that leads to gene expression.

Cell that differentiates into all cell types of adult organism is known as pluripotent and such cells are called meristematic cells in higher plants and embryonic stem cells in animals.

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Answer:

10. chlorophyll

11. There are two main stages of photosynthesis: the light-dependent reactions and the Calvin cycle.

12. Nutrition is necessary for the growth of new cells and the replacement or repair of worn-out cells. Nutrition gives energy for different metabolic processes in the body. Nutrition is required to produce resistance against different diseases.

13. trypsin

14. salivary amylase

15. Hydrochloric acid helps your body to break down, digest, and absorb nutrients such as protein. The hydrochloric acid found in the stomach facilitates digestion by disintegrating complex large food molecules into simpler molecules. The acid activates the pepsinogen enzyme required to digest proteins.

16. Saliva, the watery liquid produced by glands located under the tongue, is an essential component of the digestive process. Saliva is 98% water, so it moistens the mouth and helps compact food into softened particles for easier swallowing.

17. Digestive enzymes play a key role in breaking down the food you eat. These proteins speed up chemical reactions that turn nutrients into substances that your digestive tract can absorb. Your saliva has digestive enzymes in it. Some of your organs, including your pancreas, gallbladder, and liver, also release them.

18. small intestine

19. heterotrophic  

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Answer:

the manipulated variable is the growth rate of the grass, or the amount of food the rabbits have. the responding variable is the rabbits themselves. the constant is everything else in the scenario. the environment, the predators, etc.

Answer:

collision the force or speed with which something moves

Explanation:

Chloroplasts, thylakoids, and chlorophyll are the three main biological components that make sure photosynthesis occurs. Chloroplasts found in the mesophyll of leaves are where photosynthesis occurs.

The leaves, stems, and roots of a plant are its principal "organs" or structures. They are composed of collections of specialized tissues with structures that are appropriate for the functions they carry out. The key characteristics of these buildings and their purposes are summarized in the table below. In plants, the chloroplasts, which house the chlorophyll, are where photosynthesis occurs. The thylakoid membrane, a third inner membrane that creates lengthy folds within the chloroplast and is bordered by a double membrane, is present inside chloroplasts.

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Answer:

a. mitosis; the injury would trigger cell division to replace those cells ; results in 2 identical cells

Explanation:

Mitosis is the cell-creation process that an animal would undergo while healing a cut. It is a division that results in two daughter cells. The answer is not binary fission as that is an asexual reproductive method that occurs most often in simple, single-celled organisms like bacteria. It would not be used in the body during the process of healing a cut. The answer is not that it results in 4 identical cells, as mitosis (which is the process used in healing a cut) can only result in 2 identical daughter cells, not four. 4 resulting cells is characteristic of meiosis, which differs from mitosis as each of the 4 daughter cells created in this process are genetically unique and only contain half as much DNA as the parent cell. With these understandings in mind, you can rule out all options other than A.

Answer:

Acquired traits develop during life (not in your DNA) and answers are below:

Explanation:

Examples:

-Things you learned

(riding a bike, reading, writing, painting, drawing, cooking, school subjects, etc.)

-Things that happened to you

(short hair, broken bone, plastic surgery, dyed hair, etc.)

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Answer:

randomly select different areas to count the dandelions, average the numbers and then multiply by the number of plots your grid contains. 6. In a forest that measures 5 miles by 5 miles, a sample was taken to count the number of silver maple trees in the forest.

Random sampling is used in sampling biological products. It is made up of subsets from the larger population in which the subset of individuals is selected randomly with equal probability.

Therefore this is how you calculate the random sample size.

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Answer:

sugar

Explanation:

Answer:

See the attachment.

Hope u understand

In the given question, 5₹ is the fixed charge and 3₹ is the charge for each extra day.

A fixed charge is a fee or cost that remains constant and does not vary with changes in usage or consumption.

Let the fixed charge for the first three days be x and the charge for each extra day be y.

From the given information, we can set up two equations:

For Saritha: \(\rm 3x + 4y = 27 -----(equation 1)\)  

For Susy: \(\rm 3x + 2y = 21 -----(equation 2)\)

We can solve for x and y by using elimination or substitution:

Using elimination, we can multiply the second equation by 2 and subtract it from the first equation:

\(\rm 3x + 4y = 27\)

\(\rm - (6x + 4y = 42)\)

Solving above equations, we get:

\(\rm -3x = -15\)

\(\rm x = 5\)

Substituting x = 5 into one of the equations, we can solve for y:

\(\rm 3(5) + 4y = 27\)

\(\rm 15 + 4y = 27\)

\(\rm 4y = 12\)

\(\rm y = 3\)

Therefore, the fixed charge is ₹5 and the charge for each extra day is ₹3.

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a. Elongation: Ribosome shifts to the next mRNA codon.

b. Initiation: Ribosomal subunits, tRNA, mRNA combine.

c. Termination: Stop codon enters A site.

d. Translocation: Peptide transferred from P to A site.

e. Codon-Anticodon Recognition: mRNA codon matches tRNA anticodon.

a. Elongation: During translation, after the ribosome binds to the mRNA at the start codon, it shifts down to the next codon on the mRNA.

b. Initiation: Translation begins with the assembly of the translation initiation complex. The small ribosomal subunit binds to the mRNA, and the initiator tRNA carrying methionine binds to the start codon.

c. Termination: When a stop codon (UAA, UAG, or UGA) enters the A site of the ribosome, it does not have a corresponding tRNA.

d. Translocation: During elongation, the growing polypeptide chain is transferred from the tRNA in the P site to the amino acid carried by the tRNA in the A site.

e. Codon-Anticodon Recognition: Each mRNA codon is matched with a complementary anticodon on the tRNA. The anticodon of the tRNA recognizes and binds to the codon on the mRNA through base pairing rules.

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Answer: C. 2 ft

Explanation:

if the scale is 1:2,000

This means that if the original plane flyes 2,000ft above the ground, the model plane will fly 1ft above the ground.

Now, if the plane flies 4,000ft above the ground, this is two times as the number from above, then the model plane will also fly two times as the number from above.

2*1ft = 2ft.

Now, we also can do it as:

2000ft equiv to 1 ft.

4000ft equiv to x

x = 1ft*(4000ft/2000ft) = 1ft*2 = 2ft.

Answer:

The color of order  

The pattern of light is always the same in a primary rainbow because each color is reflected at its own particular wavelength. In a primary rainbow, the colors will be in the order of red, orange, yellow, green, blue, indigo and violet.

Explanation:

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Answer:

 Red, Orange, Yellow, Green, Blue, Indigo and Violet

Answer:

an organelle is any of a number of organized or specialized structures within a living cell. I think cells have organelles because organelles are found in virtually all eukaryotic cells. They carry out essential functions that are necessary for the survival of cells – harvesting energy, making new proteins, getting rid of waste and so on.

Explanation:

Down syndrome mosaicism is thought to result from nondisjunction (when chromosomes do not fuse into separate cells) during embryonic cell division.

A person with Mosaic Down Syndrome he has two cell lines. One normal he has 46 chromosomes and one extra he has 47 chromosomes including  chromosome 21. The prognosis of intelligence and the risk of medical complications may depend on the proportion of her trisomy 21 cells in all different tissues. , including the brain. However, in practice, it is not possible to karyotype every cell in the body, so risk cannot be predicted. Some people with mosaic Down syndrome have very subtle clinical signs and  normal intelligence. However, people without detectable mosaicism may still have very different results. If either parent has germline mosaicism for trisomy 21,  the risk for a second affected child is higher than the age-based risk for the mother.

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Answer:

The correct answer is - mitotic division or mitosis.

Explanation:

GMOs or genetically modified organisms are organisms, plants, animals whose DNA or genes are altered with the help of genetic engineers. In this case, transgenic tomatoes that are insect resistant, are produced to reduce the cost spend on using pesticides.

These altered genes transfer in the bacterium that reproduces in and passing the gene for insect resistance in a leaf cell onto the cells that develop from it.

Answer:

Interactions between cyclins and cyclin-dependent kinases. Disruptions to the cell cycle may result in cancer and/or programmed cell death (apoptosis).

Answer: Scientific name: Felis catus.

Explanation: I hope this helps :p

Answer:

Felis catus

Explanation:

Hope this helps

The plasma membrane, also known as the cell membrane, is the membrane found in all cells that separates the cell's interior from its surroundings.

A cell wall is attached to the plasma membrane on the outside of bacterial and plant cells. Most plasma membranes are approximately 50% lipid and 50% protein by weight, with glycolipids and glycoproteins accounting for 5 to 10% of the membrane mass.

The plasma membrane shields the cell from its surroundings, facilitates cellular transport, and transmits cellular signals. The plasma membrane structure is described by the fluid mosaic model as a mosaic of phospholipids, cholesterol, proteins, and carbohydrates.

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The statement that is not one of Darwin's 4 points of natural selection is that there are traits that occur due to mutations. Thus, the correct option for this question is B.

Natural selection may be characterized as the methodology through which the populations of living organisms adapt and change themselves. Individuals in a population are naturally variable, meaning that they are all different in some ways.

There are four principles at work in evolution. They include variation, inheritance, selection, and time. These are considered the components of the evolutionary mechanism of natural selection. It also signifies more individuals are produced than can survive, there is, therefore, a struggle for existence, individuals within a species show variation, and offspring tend to inherit their parents' characters.

Therefore, the correct option for this question is B.

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The organism that is likely to suffer the least from the dumping of PCBs into the ecosystem would be protists, option (c) is correct.

PCBs are persistent organic pollutants that can accumulate in the food chain and have harmful effects on organisms, including developmental, reproductive, and immune system disorders. As herring feed on small chemo heterotrophic protists and animal larvae, they may accumulate PCBs in their bodies, and the predators that eat them, including larger predatory fish and apex sharks, may also accumulate these pollutants.

However, protists are at the lowest level of the food chain and are less likely to accumulate PCBs to the same extent as higher trophic-level organisms, option (c) is correct.

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The complete question is:

Adult Herring are fish that feed primarily on small chemoheterotrophic protists and animal larvae. These larvae in turn feed on photoautotrophic protists. Adult herring are eaten by larger predatory fish, which are in turn eaten by apex sharks. If anthropogenic activity dumps a large number of PCBs into their ecosystem, which organism is likely to suffer the least?

a) the humans that eat the herring

b) adult herring

c) protists

d) sharks

e) all organisms will suffer equally

the athlete is moving at a pace of 67.3 metres per second. The word "speed" is used to refer to how quickly something is going.

We must determine the distance covered in a lap—the circumference of the circular track—in order to determine the athlete's pace. diameter times circumference

Circumference equals x 1500 metres multiplied by 4712.4 metres (rounded to one decimal place)

The method below can be used to determine the athlete's speed because they completed this distance in 70 seconds.

Distance times time, or speed.

speed equals 4712.4 metres per 70 seconds.

67.3 metres per second is the speed (rounded to one decimal place)

Thus, the athlete is moving at a pace of 67.3 metres per second.

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The chi-square value for Dr. Dopsis' proposal of recessive epistasis is 5.10.

Assuming Dr. Dopsis had a sample size of 100 F2 offspring, and the observed number of offspring for each phenotype was as follows:

Phenotype A: 42

Phenotype B: 23

Phenotype C: 35

To work out the chi-square value for Dr. Dopsis' proposal of recessive epistasis, calculate the expected values for each phenotype based on the 9:4:3 ratio. The expected values for the three phenotypes would be:

9 ÷ 16 x total number of F2 offspring = expected number of offspring with phenotype A

Phenotype A: 9 ÷ 16 x 100 = 56.25

4 ÷ 16 x total number of F2 offspring = expected number of offspring with phenotype B

Phenotype B: 4 ÷ 16 x 100 = 25

3 ÷ 16 x total number of F2 offspring = expected number of offspring with phenotype C

Phenotype C: 3 ÷ 16 x 100 = 18.75

The chi-square value can then be calculated as follows:

χ² = ∑(O - E)² ÷ E

where O = observed value, E = expected value, and ∑ = sum over all phenotypes.

[(42-56.25)² ÷ 56.25] + [(23-25)² ÷ 25] + [(35-18.75)² ÷ 18.75] = 5.10

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The correct question is:

Dr. O. Sophila, a close friend of Dr. Ara B. Dopsis, reviews the F2 results in Dr. Dopsis obtained in his experiment with iris plants described in Genetic Analysis. Dr. Sophila thinks the F2 progeny demonstrates that a single gene with incomplete dominance has produced a 1:2:1 ratio. Dr. Dopsis insists his proposal of recessive epistasis producing a 9:4:3 ratio in the F2 is correct. To test his proposal, Dr. Dopsis examines the F2 data under the assumptions of the single-gene incomplete dominance model using chi-square analysis. What is the chi-square value?

Transition refers to a point mutation in which one base is replaced by another of the same class (purine or pyrimidine) while transversion refers to a point mutation in which a purine is replaced with a pyrimidine or vice versa.

Explanation:Does transition mutations or transversion mutations Require RNA polymerase?

Answer:

the answer is 7

Explanation:

Im pretty sure it's 7

The following is likely a result of the acetylcholine acting on the post-synaptic cell Chemically gated sodium channels will open. Option A.

At the presynaptic end, acetylcholine is stored within presynaptic vesicles. Upon stimulation of the presynaptic terminal, acetylcholine is released from the vesicle and enters the synaptic cleft where the neurotransmitter can freely bind to the receptor. Postsynaptic responses are initiated by acetylcholine receptor-ligand binding.

The postsynaptic membrane contains specific ACh receptors that are concentrated opposite the active zone. This is one of the most characteristic ion channels. These openings allow ion flow after specific binding of ACh. Within the autonomic nervous system, acetylcholine operates in a similar manner by being released from the terminals of neurons and binding to receptors on the postsynaptic membrane of other cells.

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Answer:

Explanation:

Answer:

A

Explanation:

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