Facilitated diffusion across a biological membrane requires ________ and moves a substance ________ its concentration gradient.
A)energy; down
B)transport proteins; down
C)energy and transport proteins; against
D)transport proteins; against

Question

Quizplus · Accepted Answer

Facilitated diffusion requires transport proteins to help move substances across the membrane without using energy, and it moves substances down their concentration gradient.

Facilitated Diffusion Across a Biological Membrane Requires ________ and Moves