- A Cytoplasm
- B Mitochondrial matrix
- C Inner mitochondrial membrane
- D Nucleus
Correct answer: B. Mitochondrial matrix
Explanation: The Krebs cycle (citric acid cycle) takes place in the mitochondrial matrix, using acetyl CoA derived from pyruvate.
Concept context
Glycolysis, the Krebs cycle, the electron transport chain, fermentation, and the respiratory quotient. The cellular energy-release counterpart to photosynthesis.