A transport mechanism that can move a substance against a concentration gradient by using cellular energy is
A) simple diffusion.
B) facilitated diffusion.
C) osmosis.
D) bulk transport.
E) active transport.

Question

Quizplus · Accepted Answer

Active transport is the only transport mechanism that can move a substance against a concentration gradient by using cellular energy. Simple diffusion, facilitated diffusion, osmosis, and bulk transport all depend on the concentration gradient and do not require energy expenditure by the cell.

A Transport Mechanism That Can Move a Substance Against a Concentration