FADH2 is produced in?
Correct answer: C. Krebs cycle
- A. Glycolysis
- B. Pyruvic acid oxidation
- C. Krebs cycle
- D. None
Explanation
The Krebs cycle, also known as the citric acid cycle, is the stage of cellular respiration where FADH2 is produced. Specifically, FADH2 is generated during the conversion of succinate to fumarate, a reaction catalyzed by the enzyme succinate dehydrogenase, where flavin adenine dinucleotide (FAD) is reduced to FADH2. This contrasts with glycolysis and pyruvic acid oxidation, which do not produce FADH2 but rather produce NADH. The 'None' option is incorrect as FADH2 is indeed produced in the Krebs cycle.
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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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