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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About Bioenergetics
Cellular respiration explains how cells release energy from glucose through glycolysis, the link reaction, Krebs cycle and electron transport chain. It includes ATP production, substrate-level and oxidative phosphorylation, aerobic versus anaerobic respiration, and the roles of mitochondria, oxygen and fermentation in energy transfer.
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