The terminal cytochrome of the respiratory chain, which donates electrons to oxygen, is:

Correct answer: C. Cytochrome a3

  • A. Cytochrome b
  • B. Cytochrome c
  • C. Cytochrome a3
  • D. Cytochrome a1

Explanation

Cytochrome a is a subunit of cytochrome c oxidase, which is the terminal complex (complex IV) in the electron transport chain. Cytochrome a directly transfers electrons to oxygen, reducing it to water.

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