Which of these three mechanisms illustrates facilitated diffusion?
A)A
B)B
C)C
D)both A and B
E)none of these

Question

Quizplus · Accepted Answer

Facilitated diffusion involves the use of a carrier protein to transport small molecules across a membrane. Mechanism B shows a carrier protein (represented by the pink shape) transporting a molecule (represented by the green shape) across the membrane from a region of high concentration to a region of low concentration. Mechanisms A and C do not involve carrier proteins and do not demonstrate facilitated diffusion.

Which of These Three Mechanisms Illustrates Facilitated Diffusion