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Fermentation - Fermentation ., Inyeastcells(

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Fermentation Fermentation is an anaerobic process in which energy can be released from glucose even though  oxygen is not available.  Fermentation  occurs in yeast cells, and a form of fermentation takes place  in bacteria and in the muscle cells of animals.  In yeast cells (the yeast used for baking and producing alcoholic beverages), glucose can be  metabolized through cellular respiration as in other cells. When oxygen is lacking, however, glucose  is still metabolized to pyruvic acid via glycolysis. The pyruvic acid is converted first to acetaldehyde  and then to ethyl alcohol. The net gain of ATP to the yeast cell is two molecules—the two molecules  of ATP normally produced in glycolysis. Yeasts are able to participate in fermentation because they have the necessary enzyme to convert  pyruvic acid to ethyl alcohol. This process is essential because it removes electrons and hydrogen 
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