What effect will increasing the number of c subunits in ATP synthase have on the P:O ratio? A) It will increase for both NADH and FADH₂. B) It will increase for NADH and decrease for FADH₂. C) It will decrease for NADH and increase for FADH₂. D) It will decrease for both NADH and FADH₂. E) It will remain unchanged for both NADH and FADH₂.

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Quizplus · Accepted Answer

The P:O ratio, which indicates the number of ATP molecules synthesized per oxygen atom reduced, is influenced by the efficiency of ATP synthase. Increasing the number of c subunits in ATP synthase makes the enzyme less efficient, as more protons are required to make one rotation and synthesize ATP. This inefficiency leads to a decrease in the P:O ratio for both NADH and FADH2, as more protons (and thus more electron transport) are needed per ATP synthesized.

What Effect Will Increasing the Number of C Subunits in ATP