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What's the role of oxygen in cellular respiration?

A. It accepts electrons and keeps the electron transport chain running.
B. It breaks down carbon-based sugar molecules to release energy.
C. It combines with hydrogen ions in sugar molecules to release energy.
D. It supplies electrons to the electron transport chain to keep it running.

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Final answer:

Oxygen's role as the final electron acceptor in cellular respiration is vital for ATP production.


Explanation:

Oxygen's role in cellular respiration is crucial as it serves as the final electron acceptor at the end of the electron transport chain. It combines with low-energy electrons and hydrogen ions to form water, driving the production of ATP within the mitochondria. Without oxygen, this final step cannot occur, halting the ATP synthesis process.


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