Answer: Inner mitochondrial membrane.
- A Mitochondrial matrix
- B Inner mitochondrial membrane
- C Outer mitochondrial membrane
- D Cytoplasm
Correct answer: B. Inner mitochondrial membrane
Explanation: The ETC is located in the inner mitochondrial membrane, where most ATP is generated via oxidative phosphorylation.
Aerobic respiration unfolds in three locations: glycolysis in the cytoplasm yields a small amount of ATP directly, the Krebs cycle in the mitochondrial matrix harvests electron carriers (NADH, FADH2), and the electron transport chain in the inner mitochondrial membrane uses those carriers to generate the bulk of the ATP, with O2 needed only at this final stage.
Concept context
Glycolysis, the Krebs cycle, the electron transport chain, fermentation, and the respiratory quotient. The cellular energy-release counterpart to photosynthesis.