What factors are required for net movement of a substance to occur by facilitated diffusion?
A)a concentration gradient
B)a plasma membrane
C)a transport protein
D)All of these choices are correct.

Question

Quizplus · Accepted Answer

All of these factors are required for net movement of a substance to occur by facilitated diffusion. A concentration gradient is necessary to drive the movement of the substance, a plasma membrane is necessary to provide a barrier and regulate the movement of the substance, and a transport protein is necessary to facilitate the movement of the substance across the membrane.

What Factors Are Required for Net Movement of a Substance