NEET · BiologyHard
Consider the mitochondrial electron transport chain. If the ratio of ATP produced to oxygen atoms consumed (P/O ratio) for NADH is , what is the theoretical maximum number of protons pumped across the inner mitochondrial membrane per NADH molecule oxidized?
- A.6 protons
- B.8 protons
- C.10 protons
- D.12 protons
Show correct answer & step-by-step solution
Correct answer: C — 10 protons
Solution
- Complex I pumps 4 protons, Complex III pumps 4 protons, and Complex IV pumps 2 protons.
- The total number of protons pumped per NADH is $4 + 4 + 2 = 10$.
- The P/O ratio of is consistent with the consumption of approximately protons per ATP synthesized.
- Hence the answer is (C).
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