Simple diffusion and facilitated diffusion are related in that both

(A) require protein carriers
(B) depend on a concentration gradient
(C) occur via contractions of cytoskeletal elements attached to membrane proteins
(D) are endergonic processes and thus require the hydrolysis of ATP
(E) occur in eukaryotic cells but not in prokaryotic cells


Answer: (B) depend on a concentration gradient

Biology & Microbiology

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