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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3. Energy & Cell Processes

Review of Aerobic Cellular Respiration

Anatomy & Physiology

3. Energy & Cell Processes

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 crucial in the final stage of aerobic respiration, known as the electron transport chain (ETC).

Identify the stages of aerobic respiration: Glycolysis, the citric acid cycle (Krebs cycle), and the electron transport chain are the main stages.

Recognize that oxygen is not used in glycolysis or the citric acid cycle: These stages do not require oxygen directly; instead, they produce molecules that carry electrons to the ETC.

Focus on the electron transport chain: In the ETC, electrons are transferred through a series of proteins, and oxygen acts as the final electron acceptor.

Explain the formation of water: When oxygen accepts electrons at the end of the ETC, it combines with protons (H+) to form water (H2O), completing the process of aerobic respiration.