Which of the following makes direct use of oxygen?
Correct answer: C. Electron transport chain
- A. Glycolysis
- B. Krebs or citric acid cycle
- C. Electron transport chain
- D. Fermentation
Explanation
The electron transport chain occurs in the inner mitochondrial membrane and directly uses oxygen. Oxygen serves as the final electron acceptor in the electron transport chain, accepting electrons and forming water. This proton gradient drives ATP synthesis through oxidative phosphorylation.
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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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