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Lactic acid or ethanol is the common final product of glucose fermentation. Why can pyruvate not be a final product of glucose fermentation?

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Lactic acid or ethanol is the common final product of glucose fermentation. Why can pyruvate not be a final product of glucose fermentation?
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Fermentation is a metabolic process in which an organism converts a carbohydrate, such as starch or sugar, into an alcohol or an acid. 

In ethanol fermentation, one glucose molecule is converted into two ethanol molecules and two carbon dioxide molecules. In lactic acid fermentation, one glucose molecule is converted into cellular energy and the metabolite lactate, which is lactic...

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