How would it be possible to have a change in a single base of DNA, but have the protein not change and be functional?

The change in single base results in the substitution by a chemically similar amino acid

Explanation:

Whenever a change in one of the bases on the DNA sequence leads to the synthesis of a chemically similar amino acid (e.g glutamate substituted by aspartate, a fellow amino acid with acidic side chain) the protein formed is not altered, and still retains its function. Hence, this type of single base change is known as Silent mutation

answer; i believe the correct answer is (a)0

a scenario where a cell may be needed to perform a form of endocytosis is when transporting large molecules. a scenario where a cell may be needed to perform a form of exocytosis is when releasing the large molecule from the cell.