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What is Enzyme  responsible  for  complete  oxidation  of glucose to CO2 and water is present in: and explain in detail?
Under aerobic conditions, pyruvate is taken up into mitochondria, and after oxidative decarboxylation to acetyl-CoA is oxidized to CO2 by the citric acid cycle.
Under anaerobic conditions, pyruvate is reduced by  the  NADH  to  lactate,  catalyzed  by  lactate dehydrogenase.

Harper 30th edition pg-162