For each molecule of glucose completely respired, the total number of carbon dioxide molecules released is
Correct answer: C. 6
- A. 2
- B. 4
- C. 6
- D. 8
Explanation
Two CO2 come from the oxidative decarboxylation of the two pyruvate molecules and four from the two turns of the Krebs cycle, giving six in all. Glycolysis releases none, which is why the link reaction and Krebs account for every CO2 breathed out.
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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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