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Both NADH and FADH₂ are formed during:

Correct answer: C. Krebs cycle

  • A. Glycolysis
  • B. Electron transport chain
  • C. Krebs cycle
  • D. Fermentation

Explanation

The Krebs cycle is the stage of cellular respiration where NADH and FADH₂ are produced through the oxidation of acetyl-CoA. In contrast, glycolysis produces only NADH, while the electron transport chain consumes NADH and FADH₂ to generate ATP. Fermentation does not produce FADH₂ and uses NADH to regenerate NAD⁺.

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About Bioenergetics

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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