Facilitated Diffusion

AP Biology· difficulty 2/5

Facilitated diffusion differs from simple diffusion in that it

  • A

    Uses transport proteins and ATP hydrolysis to move solutes against their concentration gradient

  • B

    Uses transport proteins to move solutes up their gradient without consuming any ATP

  • C

    Uses transport proteins (channels or carriers) but moves solutes down their gradient without ATP

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  • D

    Moves solutes directly through the lipid bilayer along the gradient without any membrane proteins

Explanation

Still passive (down gradient, no ATP), but uses protein channels or carriers for solutes that can't cross the bilayer alone.

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