In ______________, carrier molecules move a substance against (up) the concentration gradient.
A) simple diffusion
B) exocytosis
C) facilitated diffusion
D) active transport
E) endocytosis

Question

Quizplus · Accepted Answer

Active transport is the only process listed where substances are moved against the concentration gradient, and this process requires the use of carrier molecules.

In ______________, Carrier Molecules Move a Substance Against (Up) the Concentration