6. Which of the following is not a feature of oxidative phosphorylation?

A. Direct transfer of phosphate from a substrate molecule to ADP
B. An electrochemical gradient across the inner mitochondrial membrane
C. A membrane bound ATP synthase
D. A protonmotive force

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7. Which of the following is not a significant biological oxidizing agent?

A. FAD
B. Fe³⁺
C. O₂
D. NAD⁺

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8. How many CO₂molecules are exhaled for each O₂molecule utilized in cellular respiration?

A. 1
B. 3
C. 6
D. 12

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9. What happens after glycolysis when oxygen is available as an electron acceptor?

A. Pyruvate is formed
B. NADH is produced
C. Fermentation
D. Oxidative phosphorylation

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10. Lactic acid is produced by human muscles during strenuous exercise because of lack of

A. oxygen
B. NAD⁺
C. glucose
D. ADP and P_i

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