Carrier- mediated transport is necessary when
A) the level of nutrients in nature is very low.
B) diffusion will not allow adequate amounts of a substance to enter the cell.
C) movement into the cell is against a concentration gradient.
D) All of the above are true.

Question

Quizplus · Accepted Answer

Carrier-mediated transport is necessary when nutrients are scarce, diffusion is insufficient, or when substances need to move against a concentration gradient, making all the options correct.

Carrier- Mediated Transport Is Necessary When