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Unformatted text preview: Fermentation Without oxygen, cellular respiration could not occur because oxygen serves as the final electron acceptor in the electron transport system . The electron transport system would therefore not be available. Glycolysis can occur without oxygen. Although glycolysis does not require oxygen, it does require NAD + . Cells without oxygen available need to regenerate NAD + from NADH so that in the absence of oxygen, at least some ATP can be made by glycolysis. To regenerate NAD + from NADH, the electrons from NADH are added to pyruvate to produce alcohol (plants, yeast) or lactate (animals, bacteria). The total ATP yield of fermentation comes from glycolysis; 2 ATP molecules are produced per glucose....
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