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Which of the numbered respiratory complexes is not correctly paired with its name?

A) complex I: NADH dehydrogenase complex
B) complex II: succinate-coenzyme Q oxidoreductase complex
C) complex III: coenzyme Q-cytochrome c oxidoreductase complex
D) complex IV: cytochrome c reductase complex
E) none of the above

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Final answer:

Option D) Complex IV, listed as cytochrome c reductase complex, is incorrectly named. It should be called cytochrome c oxidase complex. Thus, D is the answer not correctly paired with its name.

Step-by-step explanation:

The respiratory complexes in the question are all part of the electron transport chain, a series of protein complexes located in the inner mitochondrial membrane that play a key role in cellular respiration. The student is asked to identify which of the listed complexes is incorrectly paired with its name.

  • Complex I: Known as NADH dehydrogenase complex or NADH-coenzyme Q oxidoreductase.
  • Complex II: Recognized as succinate-coenzyme Q oxidoreductase complex or succinate dehydrogenase.
  • Complex III: Termed as coenzyme Q-cytochrome c oxidoreductase complex.
  • Complex IV: Incorrectly paired here as cytochrome c reductase complex, but accurately known as cytochrome c oxidase complex.

Therefore, option D) complex IV: cytochrome c reductase complex is not correctly paired with its name, should be called cytochrome c oxidase complex. The correct answer is D.

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