4. Considering the following statements about active transport, which of these statements are true?
I. Facilitated diffusion is a special kind of active
transport that does not require energy.
II. Active transport requires energy,
usually in the form of ATP hydrolysis.
III. Active transport moves substances
down their concentration gradients.
IV. All proteins involved in active
transport are carrier proteins
V. Ion channels facilitate the active transport
of ions
(A)II and IV
(B) I, II, III and IV
(C)II, IV and V
(D) I, II and IV
(E)All
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