Which process requires the use of membrane proteins?

a) pinocytosis

b) diffusion

c) osmosis

d) facilitated diffusion

In cells, some molecules can move down their concentration gradients by crossing the lipid portion of the membrane directly, while others must pass through membrane proteins in a process called facilitated diffusion.

Explanation: so it is

D :)

yeah I think it is D too to that's what I think it is

c

explanation:

it's c.us forest service