Energy and Metabolism

ID #2210

In anaerobic conditions, is the only yield the 2 ATP directly from glycolysis? Is there no ATP produced when the electrons are given to the organic molecules?

ATP is only made during glycolysis under anaerobic conditions, so yes, there are 2 molecules of ATP generated per molecule of glucose. Glucose is not completely oxidized under anaerobic conditions, so less ATP is made from each molecule of glucose compared to the yield from aerobic respiration. Fermentation regenerates NAD+, but no additional ATP are synthesized. Cells compensate for this, however, by performing glycolysis at a higher/faster rate. 

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