MCQ practice · SSC Biology Board questions · Chapter 4: Bioenergetics
How many molecules of ATP are produced from 6 molecules of FADH2?
Think it through first, then pick an option.
- a 6
- b 12
- c 18
- d 24
Answer and explanation
Correct answer: b 12
6 × 2 = 12 ATP, since 1 FADH2 gives 2 ATP.
Why the other options are wrong
- a 6: 6 would hold if 1 FADH2 = 1 ATP; but 1 FADH2 = 2 ATP.
- c 18: 18 would hold if 1 FADH2 = 3 ATP; 3 ATP is the rate for NADH.
- d 24: 24 is the total ATP of the Krebs stage in the book, not of FADH2 alone.
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