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3 years ago

Which of the following statements is true?

Biology

1 answer:

fiasKO [112]3 years ago

3 0

Answer: Mutations are the most fundamental way to add new genes to a gene pool.

Explanation:

Mutation refers to the process through which the normal sequence of altered. It may be either acquired or hereditary. It leads to addition of new genes to a gene pool.

The reason for not considering other statements as true are:

1. It is the hereditary mutation that are passed form parent to offspring's and acquired mutation is caused by external factors.

2. Acquired mutation are caused by external factors such as radiation.

3. Germ line mutation are important to evolution because they can be inherited.

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Which cell structure is enclosed in a double membrane and is response for communicating with all other parts of the cell?

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Answer:

Eukaryotic Cells,

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3 years ago

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Describe how epinephrine has different effects in different target tissues

vazorg [7]

Answer:

Epinephrine binds to receptors on some smooth muscles (ex: around arterioles) → Ca++ released from ER → intracellular Ca++ up → stimulates contraction. c. Epinephrine binds to receptors on some smooth muscles (ex: around bronchioles) → phosphorylates protein needed for response to Ca++, preventing response.

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3 years ago

You are performing a biochemical purification of enzymes involved in DNA replication. You have purified the replisome. You wish

algol [13]

Confirm that the sample has both helicase and primase activities, but not the ability to synthesize DNA

The replisome is a multiprotein-RNA complex that is required for the replication of DNA. The replisome consists of different proteins which include:

1. Helicase enzymes that unwind and separate the DNA strand

2. Replication factor C (RFC), a DNA-dependent ATP that acts as an activator of DNA polymerase.

3. Proliferating cell nuclear antigen (PCNA)

4. DNA gyrase/topoisomerase that cuts and reseals DNA strands, which is essential for DNA synthesis.

5. Primase enzyme that synthesizes short RNA fragments called primers.

6. DNA polymerase III, an enzyme that catalyzes the polymerization of deoxyribonucleotides into a DNA strand.

7. DNA ligases enzymes that form phosphodiester bonds at a single-strand break in DNA

A primosome is a multiprotein complex responsible for creating RNA primers on single-stranded DNA (ssDNA) during the replication process.

The primosome is composed of different primase and helicase enzymes. In Escherichia coli, it consists of PriA helicase, PriB, PriC, DnaB helicase, DnaG (encoded by the dnaG gene), DnaC and DnaT primase.

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3 years ago

When the solution contains the same number of particles as what’s in the cell ______________

Setler79 [48]

Answer:

isotonic solution

Explanation:

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2 years ago

Some argue that solar power should be the main energy source for the United States. Which argument could be used against this id

docker41 [41]

Answer:

A. It contributes to global warming

Explanation:

Solar power is the power of the future and is an essential nonrenewable source of energy for man. Solar power is driven by the incoming solar energy in the form of solar rays.

Solar power is eco-friendly and doe not cause any harm can be sued in the summer season and has ample scope for greenhouse gases.

As per the statement, the solar power should be used as the main energy source in U.S can be contradicted by saying it contributes to global warming.

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3 years ago