During the respiratory chain of cellular respiration, cytochrome c oxidizes:
Correct answer: B. Cytochrome a₃
- A. Oxygen
- B. Cytochrome a₃
- C. NADH
- D. FADH₂
Explanation
During the respiratory chain of cellular respiration, cytochrome c oxidizes cytochrome a₃. Cytochrome c acts as an electron carrier, transferring electrons from complex III to complex IV, where cytochrome a₃ is located. In this process, cytochrome c itself is oxidized as it donates electrons, and cytochrome a₃ is reduced. This step is crucial because it allows electrons to continue down the chain and ultimately reduces oxygen to water at the end of the respiratory chain. Cytochrome c does not oxidize oxygen directly, nor does it act on NADH or FADH₂, which serve as earlier electron donors in the chain.
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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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