After glycolysis, the pyruvate molecules formed are converted to acetyl CoA prior to entering the citric acid cycle. This cycle produces electron carriers NADH and FADH2 as byproducts. In the last step of this cycle, malate undergoes dehydrogenation to produce oxaloacetate. This is also the last reaction in the cycle that produces the electron carrier, NADH.
Identify the oxidant in the following coupled redox reaction: Malate + NAD+ → Oxaloacetate + NADH + H+. The coupled reaction involves these two half reactions:
NAD+ + 2H+ + 2e- → NADH + H+
oxaloacetate + 2H+ + 2e- → malate
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