Answer
In the absence of oxygen,the cell carry out anaerobic
respiration.Krebs cycle and the electron transport chain are not able to
operate,only glycolysis occur and two ATP molecules are produced from each
glucose molecule.In anaerobic respiration in yeast,pyruvate is decarboxylated
to become etahnel.Ethanel is then reduced to ethanol by NADH.
In anaerobic respiration in muscle cells, pyruvate is reduced
to lactate by NADH directly.
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