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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統計: A(12), B(2), C(3), D(2), E(1) #3331848

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