Cytochrome b is reduced by:
Correct answer: B. Coenzyme Q
- A. Cytochrome c
- B. Coenzyme Q
- C. NADH
- D. Cytochrome a
Explanation
In the electron transport chain, cytochrome b is reduced by receiving electrons from coenzyme Q (ubiquinone) at complex III. This reduction is crucial for the continued transfer of electrons through the chain. Cytochrome c, cytochrome a, and NADH play different roles in the electron transport chain. Cytochrome c receives electrons from cytochrome b but does not reduce it. Cytochrome a is part of complex IV and is involved later in the process. NADH donates electrons to complex I, not directly to cytochrome b.
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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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