From one pyruvate passing through the Krebs cycle, how many NADH are formed?
Correct answer: C. 3
- A. 1
- B. 2
- C. 3
- D. 4
Explanation
From one molecule of pyruvate passing through the Krebs cycle, three molecules of NADH are formed. During the cycle, pyruvate is first converted into acetyl-CoA, which then enters the Krebs cycle. As the acetyl-CoA is oxidized, hydrogen atoms are transferred to NAD⁺, forming NADH at three different steps. These NADH molecules later carry high-energy electrons to the electron transport chain, where they are used to produce ATP. Thus, each pyruvate generates three NADH molecules in the Krebs cycle.
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Cellular respiration explains how cells release energy from glucose through glycolysis, the link reaction, Krebs cycle and electron transport chain. It includes ATP production, substrate-level and oxidative phosphorylation, aerobic versus anaerobic respiration, and the roles of mitochondria, oxygen and fermentation in energy transfer.
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