Sample Questions — The respiratory balance sheet
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MCQ
Why might the actual ATP yield in a eukaryotic cell be less than 38 ATPs?
✅ Correct Answer: C
Proton leak reduces efficiency of chemiosmotic ATP synthesis.
MCQ
Which of the following statements is/are true regarding the respiratory balance sheet?
✅ Correct Answer: B
The NCERT clearly states that only directly utilisable ATPs are considered in the respiratory balance sheet. Theoretical values are avoided in practical calculations.
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MCQ
Why must we assume no alternative substrates enter the respiratory pathway when calculating ATP yield?
✅ Correct Answer: B
Alternate substrates like fats/proteins enter the pathway at different points, altering ATP yield.
MCQ
If one NADH yields 3 ATP and one FADH2 yields 2 ATP, what is the total ATP yield from 10 NADH and 2 FADH₂?
✅ Correct Answer: A
10×3 + 2×2 = 30 + 4 = 34 ATP from ETS
MCQ
Why is it not valid to assume that all NADH from glycolysis contributes to ATP yield?
✅ Correct Answer: C
There’s no direct NADH shuttle in some cells; hence, the assumption.
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