What is the source of the oxygen used to form water in the complete reactions of cellular respiration?
A) carbon dioxide (CO₂)
B) glucose (C₆H₁₂O₆)
C) pyruvate (C₃H₃O₃-)
D) molecular oxygen (O₂)

Question

Quizplus · Accepted Answer

Molecular oxygen (O₂) is the source of the oxygen used to form water in the complete reactions of cellular respiration. Oxygen is the final electron acceptor in the electron transport chain, and it combines with hydrogen ions (protons) to form water (H₂O).

What Is the Source of the Oxygen Used to Form