Facilitated diffusion differs from ordinary diffusion in that
A) facilitated diffusion never eliminates the concentration gradient.
B) facilitated diffusion moves molecules from an area of higher concentration to lower concentration.
C) facilitated diffusion consumes no ATP.
D) the rate of molecular movement is not limited by the number of available carrier molecules.
E) the rate of molecular movement is limited by the number of available carrier molecules.

Question

Quizplus · Accepted Answer

Facilitated diffusion relies on carrier proteins to transport molecules across the cell membrane, and the rate of transport is limited by the number of these carrier proteins available.

Facilitated Diffusion Differs from Ordinary Diffusion in That