which substrate is oxidized during cellular respiration
Use NAD + as the oxidizing agent that accepts electrons from food during glycolysis. Fermentation and cellular respiration differ in: How NADH is oxidized back to NAD + . Recall that the oxidized form, NAD + is necessary for glycolysis to continue. During fermentation, NADH passes electrons to pyruvate or some derivative. As pyruvate is reduced, NADH is oxidized to NAD + . Electrons transferred from NADH to pyruvate or other substrates are not used to power ATP production.