Molecules that traverse a membrane against their concentration gradient do so by _______ transport.
A) active
B) passive
C) carrier-mediated
D) channel-mediated

Question

Quizplus · Accepted Answer

Active transport is the only type of transport that can move molecules against their concentration gradient, requiring energy input, such as from ATP hydrolysis. Passive transport (B) moves molecules down their concentration gradient without energy input. Carrier-mediated (C) and channel-mediated (D) transport can facilitate the movement of molecules across membranes but do not move them against their concentration gradient.

Molecules That Traverse a Membrane Against Their Concentration Gradient Do