How many moles of carbon dioxide are produced by complete oxidation of one mole of puruvic acid?
Correct answer: C. 3
- A. 1
- B. 2
- C. 3
- D. 6
Explanation
One pyruvic acid molecule has three carbon atoms, and complete oxidation releases all three as carbon dioxide: one during the link reaction and two during the Krebs cycle. Thus, 1 mole of pyruvic acid produces 3 moles of carbon dioxide. The common mistake is choosing 2 moles by counting only the two Krebs-cycle decarboxylations and ignoring the link reaction.
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About Cellular Respiration
Cellular respiration releases energy from glucose through glycolysis, the link reaction, the Krebs cycle and the electron transport chain, producing ATP. The pathway differs in oxygen availability: aerobic respiration uses oxygen and yields more ATP, while anaerobic respiration produces much less ATP and forms lactic acid in muscles or ethanol and carbon dioxide in yeast.
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