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 using cellular energy.

Question

Quizplus · Accepted Answer

Simple diffusion and facilitated diffusion both move substances across a membrane from an area of higher concentration to an area of lower concentration without using cellular energy. However, facilitated diffusion requires a special carrier molecule while simple diffusion does not. Neither process specifically moves water across a membrane, making choice B incorrect. Choice A is also incorrect, as neither process requires cellular energy.

What Characteristic Do Simple Diffusion and Facilitated Diffusion Share