Which of the following processes requires a carrier protein?
A) diffusion only
B) facilitated diffusion only
C) active transport only
D) endocytosis only
E) both facilitated diffusion and active transport

Question

Quizplus · Accepted Answer

Facilitated diffusion and active transport both require carrier proteins to transport molecules across the membrane. Facilitated diffusion relies on a carrier protein to facilitate the movement of molecules down their concentration gradient, while active transport requires a carrier protein to move molecules against their concentration gradient, requiring the input of energy. Diffusion does not require a carrier protein as molecules move down their concentration gradient passively, and endocytosis involves the engulfment of molecules by the cell membrane, rather than their transport across it via a carrier protein.

Which of the Following Processes Requires a Carrier Protein