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Multiple Choice
In cellular respiration, what happens to the oxygen that is used?
A
It is stored in the mitochondria.
B
It is reduced to form water.
C
It is converted into carbon dioxide.
D
It is used to oxidize glucose.
Verified step by step guidance
1
Understand the role of oxygen in cellular respiration: Oxygen is the final electron acceptor in the electron transport chain, a crucial step in cellular respiration.
Recognize the process of reduction: In the context of cellular respiration, reduction refers to the gain of electrons by a molecule. Oxygen gains electrons during this process.
Identify the formation of water: As oxygen gains electrons, it also combines with protons (H⁺ ions) to form water (H₂O). This is a key outcome of the electron transport chain.
Clarify the misconception about carbon dioxide: Carbon dioxide is produced during the earlier stages of cellular respiration, specifically in the Krebs cycle, not from oxygen.
Differentiate between oxidation and reduction: While oxygen is reduced to form water, glucose is oxidized to release energy, carbon dioxide, and electrons that are eventually transferred to oxygen.