In respiratory electron transport chain, the third ATP is produced by the oxidation of:
Correct answer: D. Cytochrome - a3
- A. NADH
- B. Cytochrome - b
- C. Cytochrome - c
- D. Cytochrome - a3
Explanation
When cytochrome a3 is oxidized and O2 is reduced to form water, electrons release some free energy to come to the lower energy state and as a result ADP is phosphorylated into ATP by inorganic phosphate using that free energy.
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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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