The Krebs cycle begins with:
Correct answer: A. Acetyl-CoA
- A. Acetyl-CoA
- B. Hydrochloric acid
- C. Lysine
- D. PGA
Explanation
The Krebs Cycle starts with the combination of acetyl-CoA, a two-carbon compound derived from the breakdown of pyruvic acid in glycolysis or fatty acids in beta-oxidation, with oxaloacetic acid, a four-carbon compound. This condensation forms citric acid, a six-carbon compound, initiating 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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