Facilitated diffusion across a membrane requires __________ and moves a solute ________ its concentration gradient. a. transport proteins . up (against) b. transport proteins... down c. energy and transport

Facilitated diffusion across a membrane requires __________ and moves a solute ________ its concentration gradient. a. transport proteins . up (against) b. transport proteins... down c. energy and transport proteins .. up d. energy and transport proteins... down

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