<h2>Answer</h2>
If a mutation occurs in a gene, the structure of a <u>Protein</u> within the organism may be changed.
<h3>#CarryOnLearning</h3>
— WatanabeHaruto
Answer:
the cell wall
Explanation:
cell membrane is not rough and it doesn't support or protect the cell.
cytoplasm is the inner environment of the cell that includes organelles and nutritions. it's not rough and doesn't support or protect the cell.
A. nucleus because it is in the center of the cell and it’s the core of the cell