- A Krebs cycle, occurring in the mitochondrial matrix
- B Glycolysis, occurring in the cytoplasm
- C Oxidative phosphorylation, at the inner membrane
- D Beta oxidation, breaking down fatty acids
Correct answer: B. Glycolysis, occurring in the cytoplasm
Explanation: Glycolysis is the universal first pathway of respiration, breaking down one glucose molecule into two molecules of pyruvate in the cytoplasm.
Concept context
Glycolysis, the Krebs cycle, the electron transport chain, fermentation, and the respiratory quotient. The cellular energy-release counterpart to photosynthesis.