Question

which statement is true of both active transport and facilitated diffusion?
o both involve proteins in the cell membrane.
o both move materials down a concentration gradient.
o both occur in only one direction.
o both require atp.

Explanation:

Active transport uses carrier - proteins and requires energy (ATP) to move substances against a concentration gradient. Facilitated diffusion uses channel or carrier - proteins to move substances down a concentration gradient without energy (ATP). Both processes involve proteins in the cell membrane.

Answer:

Both involve proteins in the cell membrane.