The net gain of energy from one molecule of glucose during aerobic respiration in prokaryotes is
Correct answer: B. 38 ATP
- A. 2 ATP
- B. 38 ATP
- C. 4 ATP
- D. 40 ATP
Explanation
During aerobic respiration in prokaryotes, one molecule of glucose is completely oxidized through glycolysis, the citric acid cycle, and oxidative phosphorylation, resulting in a net gain of approximately 38 ATP. Glycolysis generates 2 ATP, the citric acid cycle contributes additional ATP, and the majority of ATP is produced during oxidative phosphorylation. Options A and C incorrectly represent partial processes or incorrect net gains, while Option D overestimates the ATP yield.
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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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