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MCQ Chapter 13 Biology Class 11 Maharashtra Board

Respiration and Energy Transfer

1. How many carbon atoms does citric acid have in the Krebs cycle?

Question 1 of 20

2. Which coenzyme is reduced to FADH₂ in the Krebs cycle?

Question 2 of 20

3. How many ATP molecules are produced per glucose molecule in the Krebs cycle via substrate-level phosphorylation?

Question 3 of 20

4. What is the role of the electron transport system (ETS)?

Question 4 of 20

5. Which complex in the ETS oxidizes NADH+H⁺?

Question 5 of 20

6. What is the mobile electron carrier between complex III and complex IV in the ETS?

Question 6 of 20

7. What is the final electron acceptor in the electron transport chain?

Question 7 of 20

8. What process couples proton movement to ATP synthesis in the ETS?

Question 8 of 20

9. How many ATP molecules are produced from the oxidation of one NADH+H⁺ in the ETS?

Question 9 of 20

10. How many ATP molecules are produced from the oxidation of one FADH₂ in the ETS?

Question 10 of 20

11. What is the total ATP yield from the complete aerobic oxidation of one glucose molecule?

Question 11 of 20

12. Which step of respiration produces the most ATP?

Question 12 of 20

13. What molecule is regenerated by the ETS for use in glycolysis and the Krebs cycle?

Question 13 of 20

14. What is the byproduct of the ETS besides ATP?

Question 14 of 20

15. Why is stepwise energy release important in respiration?

Question 15 of 20

16. What is the respiratory quotient (RQ) when carbohydrates are fully oxidized?

Question 16 of 20

17. What is the RQ for fats?

Question 17 of 20

18. What is the RQ during anaerobic respiration?

Question 18 of 20

19. Which process is used commercially in distilleries?

Question 19 of 20

20. What is the primary process in respiration?

Question 20 of 20

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