MCQ practice · SSC Biology Board questions · Chapter 4: Bioenergetics
How many molecules of ATP are made from 3 molecules of FADH2?
Think it through first, then pick an option.
- a 3
- b 6
- c 9
- d 12
Answer and explanation
Correct answer: b 6
1 FADH2 = 2 ATP, so 3 molecules give 3 × 2 = 6 ATP.
Why the other options are wrong
- a 3: 3 would hold if 1 FADH2 = 1 ATP; but 1 FADH2 = 2 ATP.
- c 9: 9 would hold if 1 FADH2 = 3 ATP; 3 ATP is the rate for NADH.
- d 12: 12 ATP is the figure for 6 FADH2, not 3.
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