Answer:
4.Cell wall protects the cell whiles organelles are found in the cell itself which is having the cell wall
This may occur<span> at ribosomes free floating in the cytoplasm or directed to the endoplasmic reticulum by the signal recognition particle
hope this helps</span>
<span>An agent, such as radiation or a chemical substance, that causes genetic mutation.
So your answer is ....
B. an agent that causes mutation in DNA
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