- A Activate the enzyme hexokinase to begin glucose breakdown under most conditions studied
- B Provide carbon atoms that are incorporated into ATP in standard reference material
- C Act as the final electron acceptor at the end of the electron transport chain
- D Directly combine with glucose in the cytoplasm during glycolysis as widely reported
Correct answer: C. Act as the final electron acceptor at the end of the electron transport chain
Explanation: In aerobic respiration, oxygen serves as the final electron acceptor of the electron transport chain, combining with electrons and protons to form water, allowing the chain to continue functioning.
Concept context
Glycolysis, the Krebs cycle, the electron transport chain, fermentation, and the respiratory quotient. The cellular energy-release counterpart to photosynthesis.