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Terminal cytochrome of respiratory chain which donates electrons to oxygen is

1. Cyt. b
2. Cyt. c
3. Cyt. a₁
4. Cyt. a₃

Correct answer: Cyt. a₃

Solution

Cytochrome a₃ is part of cytochrome c oxidase (Complex IV), the terminal enzyme of the respiratory chain. It is the component that passes electrons to oxygen, reducing it to water.

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