During oxidative phosphorylation, H2O is formed. Where does the oxygen for the synthesis of the water come from? Naim 12:05 AP Biology Chapter 9 During oxidative phosphorylation, H2O is formed. Where does the oxygen for the synthesis of the water come from? A. Carbon dioxide B. Glucose C. Molecular oxygen D. Pyruvate E. Lactate Answer: C Learn More : Share this Share on FacebookTweet on TwitterPlus on Google+