Question

What is the similarity between simple diffusion and facilitated diffusion?

A. Both move molecules from lower concentration to higher concentration.
B. Both move molecules from higher concentration to lower concentration.
C. Both need energy.
D. Both need transport protein.

Anyone know this answer?

Answer 1

The answer is B. Both move molecules from higher concentration to lower concentration.
(The difference between them is that facilitated diffusion requires a transport protein while in simple diffusion, molecules just pass right through the cell membrane.)