Facilitated diffusion differs from ordinary diffusion in that facilitated diffusion
A) expends no ATP.
B) moves molecules from an area of higher concentration to lower concentration.
C) is dependent on carrier molecules.
D) never eliminates the concentration gradient.
E) is independent of carrier molecules.

Question

Quizplus · Accepted Answer

Facilitated diffusion is a type of passive transport that moves molecules from an area of high concentration to an area of low concentration, but it is dependent on carrier molecules. Unlike active transport, facilitated diffusion does not require the expenditure of ATP to move molecules across the membrane. However, it does require the presence of specific carrier proteins in the membrane to allow the diffusion of certain polar or charged molecules that cannot easily cross the lipid bilayer of the membrane by themselves.

Facilitated Diffusion Differs from Ordinary Diffusion in That Facilitated Diffusion