View the step-by-step solution to: 30) Facilitated diffusion across a biological membrane requires

30) Facilitated diffusion across a biological membrane requires ________ and moves a substance ________ its concentration gradient.
A) energy and transport proteins . . . down
B) energy . . . down
C) transport proteins . . . down
D) energy and transport proteins . . . against
E) transport proteins . . . against

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