In which stage(s) of cellular respiration is oxygen (O₂) a reactant?Group of answer choicesoxidative phosphorylationcitric acid cycleglycolysispyruvate oxidation
Question
In which stage(s) of cellular respiration is oxygen (O₂) a reactant?Group of answer choicesoxidative phosphorylationcitric acid cycleglycolysispyruvate oxidation
Solution
Oxygen (O₂) is a reactant in the stage of cellular respiration known as oxidative phosphorylation. This is the only stage out of the ones listed (glycolysis, pyruvate oxidation, citric acid cycle, and oxidative phosphorylation) where oxygen is directly used. During oxidative phosphorylation, oxygen acts as the final electron acceptor in the electron transport chain, and gets reduced to form water.
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