Which of the Following Processes Requires a Channel Protein

Question

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

Accepted Answer

Facilitated diffusion and active transport both involve the movement of molecules across cell membranes through specific channel proteins. Facilitated diffusion allows molecules to passively move down their concentration gradient with the help of a channel or carrier protein, while active transport requires energy to move molecules against their concentration gradient, often through a protein channel or pump.