- A O2
- B CO2
- C ATP only
- D Glucose
Correct answer: B. CO2
Explanation: Pyruvate oxidative decarboxylation: pyruvate (3C) loses one carbon as CO2 and is converted to acetyl CoA (2C), which then enters the Krebs cycle by combining with oxaloacetate.
Concept context
Glycolysis, the Krebs cycle, the electron transport chain, fermentation, and the respiratory quotient. The cellular energy-release counterpart to photosynthesis.