From one pyruvate passing through Kreb's cycle, how many NADH are formed?
Correct answer: C. 3
- A. 1
- B. 2
- C. 3
- D. 4
Explanation
One pyruvate produces one NADH during its conversion to acetyl-CoA and two more NADH during its two turns of the Krebs cycle, giving 1 + 2 = 3 NADH per pyruvate. Students may choose 2 because they count only the NADH made directly in the Krebs cycle and omit 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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