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In the electron transfer chain reaction, what is the total ATP yield from two NADH2 and two FADH2 molecules together?
ASix
BTen
CTwelve
DEight
Answer & Solution
Correct answer: B. Ten
1. Each NADH2 molecule yields 3 ATP, so two NADH2 give 6 ATP.
2. Each FADH2 molecule yields 2 ATP, so two FADH2 give 4 ATP.
3. Adding them gives 6 plus 4, which equals 10 ATP.
4. The eight option wrongly treats both as 2 ATP each, so it is ruled out.
5. The twelve option wrongly treats both as 3 ATP each, so it is ruled out.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology Part 2, Ch 2 "Life Processes in Living Organisms Part 1", p.23_
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