Why is oxygen important for aerobic cellular respiration?
Correct answer: D. It is the final electron acceptor in the electron transport chain
- A. It provides the hydrogen nuclei needed to create a proton gradient in the intermembrane space
- B. It is important in creating oxaloacetic acid in the Krebs cycle
- C. It is needed for glycolysis, which begins the process of respiration in cells
- D. It is the final electron acceptor in the electron transport chain
Explanation
The final electron acceptor in cellular respiration is atmospheric oxygen. It receives electrons and also picks up H+ ions to form water molecules. The energy released by electrons is used for generation of ATP by 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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