What characteristic do simple diffusion and facilitated diffusion share?
A)Both require cellular energy for the transport of substances.
B)Both move water across a semipermeable membrane.
C)Both require a special carrier molecule to move substances across the membrane.
D)Both move a substance from a region of higher concentration to one of lower concentration without cellular energy.

Question

Quizplus · Accepted Answer

Both simple diffusion and facilitated diffusion move a substance from a region of higher concentration to one of lower concentration without requiring cellular energy. However, facilitated diffusion does require a special carrier molecule or transport protein to move substances across the membrane, while simple diffusion does not.

What Characteristic Do Simple Diffusion and Facilitated Diffusion Share