Which statement or set of statements about oxidative phosphorylation is correct?
1. Complex I of the electron transport chain transfers electrons from FADH₂ to coenzyme Q.
2. ATP synthase utilises the energy of the proton gradient to catalyze the conversion of ADP to ATP.
3. Oxygen serves as an electron acceptor in complex III.
4. Complex IV receives electrons from NADH.
A) 4
B) 1 and 2
C) 3
D) 2
E) 2, 3 and 4
IMAT 2023 · Question 31
Q31 - The electron transport chain
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The correct answer is D) 2.
Going through them:
1 is wrong: Complex I takes electrons from NADH. FADH₂ feeds in through Complex II.
2 is right: ATP synthase uses the proton gradient to make ATP.
3 is wrong: oxygen accepts electrons at Complex IV.
4 is wrong: Complex IV gets its electrons from cytochrome c, not from NADH.
So only 2.
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