Starting from end products of glycolysis, how many molecules of CO2 are produced up to the formation of succinate in a single Krebs cycle?
Correct answer: D. 3
- A. 2
- B. 12
- C. 6
- D. 3
Explanation
Starting from pyruvate (end product of glycolysis), three decarboxylation reactions occur: one during pyruvate oxidation and two during the Krebs cycle, producing a total of three CO₂ molecules per pyruvate.
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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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