Within the cell, vacuoles can be thought
of as which of the following?

Explanation:

please mark me brainliest answer

b is the best answer for this question.

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.