During aerobic respiration, molecular oxygen (O 2 ) is used for which of the following purposes?

As a source of O 2 in every reaction that produces CO 2

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8. Respiration

Review of Aerobic Cellular Respiration

General Biology

8. Respiration

Review of Aerobic Cellular Respiration

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Multiple Choice

During aerobic respiration, molecular oxygen (O₂) is used for which of the following purposes?

At the end of glycolysis to oxidize pyruvate

At the end of the citric acid cycle to regenerate citric acid

Between glycolysis and the citric acid cycle to split a carbon from pyruvate, producing CO₂

As a source of O₂ in every reaction that produces CO₂

At the end of the electron transport chain to accept electrons and form H₂O

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Verified step by step guidance

Understand the role of oxygen in aerobic respiration: Oxygen is the final electron acceptor in the electron transport chain, which is the last stage of aerobic respiration.

Review the stages of aerobic respiration: Glycolysis, the citric acid cycle (Krebs cycle), and the electron transport chain. Oxygen is not directly involved in glycolysis or the citric acid cycle.

Focus on the electron transport chain: Electrons are transferred through a series of proteins in the inner mitochondrial membrane, releasing energy used to pump protons and create a gradient.

Recognize the role of oxygen at the end of the electron transport chain: Oxygen accepts electrons and combines with protons to form water (H2O), which is essential for maintaining the flow of electrons.

Conclude that oxygen's primary purpose in aerobic respiration is to act as the final electron acceptor, forming water and allowing the electron transport chain to continue functioning efficiently.