AP Biologyeasymcq1 pt
Facilitated diffusion differs from simple diffusion because it
A.requires transport proteins but still moves solutes down their gradient
B.pumps solutes against their gradient
C.uses ATP directly
D.moves only water
Explanation
Core Concept
Channel and carrier proteins provide a polar pathway for solutes that cannot cross the bilayer, but no energy is spent — movement remains downhill.
Correct Answer
Arequires transport proteins but still moves solutes down their gradient
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