The theoretical total yield of ATP from the complete aerobic oxidation of one molecule of glucose is about
Correct answer: D. 38
- A. 2
- B. 4
- C. 12
- D. 38
Explanation
Two ATP come from glycolysis, two from the two turns of the Krebs cycle and the remainder from oxidative phosphorylation of the ten NADH and two FADH2, giving the classical figure of 38, or 36 if the cost of transporting cytoplasmic NADH into the mitochondrion is counted. The contrast with the two ATP of anaerobic respiration is the point: aerobic respiration is roughly nineteen times more efficient.
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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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