How many molecules of NADH are produced in one turn of the Krebs cycle?
Correct answer: C. 3
- A. 1
- B. 2
- C. 3
- D. 4
Explanation
One turn yields three NADH, one FADH2, one ATP by substrate level phosphorylation and two molecules of carbon dioxide. Since one glucose gives two acetyl CoA, the cycle turns twice per glucose and these figures double. Counting the reduced coenzymes correctly is what makes the total ATP calculation work 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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