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Fudgin [204]
2 years ago
7

Why do RNA viruses appear to have higher rates of mutation? (A) RNA nucleotides are more unstable than DNA nucleotides.

Biology
1 answer:
Tanzania [10]2 years ago
6 0

Replication of RNA genome in RNA virus does not involve proofreading. Thus RNA viruses have higher rates of mutation. So the correct option is B.

<h3>What is meant by proofreading? </h3><h3> </h3>

There are a variety of mechanisms in the cell to prevent mutations. Thus, permanent changes in the DNA sequence are prevented.

During the process of synthesis of DNA, DNA polymerases can analyse any mistake made during the synthesis and fix it. The majority of mispaired bases can be fixed by this process. It is called proofreading.

This process is not present in RNA and RNA polymerases. Thus RNA viruses appear to have higher rates of mutation compared to DNA viruses.

Therefore the correct option is B.

Read more about RNA viruses, here

brainly.com/question/14892485

#SPJ4

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Fossils of a species of bird are found in layer 3. Which layer is most likely to have organisms that lived at the same time as t
tino4ka555 [31]
<span>The layer most likely to have organisms which lived at the same time as the bird species is 'C', Layer 2. Layer 2 is closer to layer 3 than any of the other layers listed. Assuming that layers were laid down sequentially as time passed, it is reasonable to assume that layer 2 was laid down most closely in time to layer 3.</span>
5 0
3 years ago
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About 12 to 24 hours after the last meal, a person's blood sugar level normally varies from 60 to 90 mg per 100 ml of blood, alt
VMariaS [17]

Answer:

Homeostasis.

Explanation:

The insulin and glucagon hormone are important for the maintenance of the blood sugar level in the body. The glucagon increase the blood sugar level whereas insulin decreases the blood sugar level.

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Thus, the answer is homeostasis.

8 0
3 years ago
A scientist investigated whether giving plants different quantities of magnesium affected their growth. He
liberstina [14]

The hypothesis that the scientist could test in his investigation is as follows: IF plants are given more than 2.0mg of magnesium, THEN their growth will be negatively affected.

<h3>What is an hypothesis?</h3>

Hypothesis is a tentative conjecture explaining an observation, phenomenon or scientific problem that can be tested by further observation, investigation and/or experimentation.

An hypothesis is commonly referred to as an educated guess because it tends to provide a temporary explanation for a phenomenon.

According to this question, a scientist investigated whether giving plants different quantities of magnesium affected their growth. He measured growth by counting the number of new leaves produced.

The hypothesis of the scientist regarding the above experiment could be as follows: IF plants are given more than 2.0mg of magnesium, THEN their growth will be negatively affected.

Learn more about hypothesis at: brainly.com/question/13025783

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4 0
1 year ago
What is tRNA and its role/function
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Answer:

is to bring amino acids to the ribosome for protein production.

Explanation:

7 0
2 years ago
Hair occur in all mammal except those of rodentia , chiroptera , primata , cetacea​
Alecsey [184]
Hair occurs on all mammals except Cetacea

Hope this helps :)
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3 years ago
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