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Glycolysis is the first stage of aerobic (and anaerobic) respiration. It takes place in the cytoplasm of the cell. In glycolysis (âglucose breakingâ), ATP is used to split glucose molecules into a three-carbon compound called pyruvate. This splitting produces energy that is stored in ATP and a molecule called NADH.
Anaerobic Respiration. In the absence of oxygen, glycolysis takes place during anaerobic respiration as it does during aerobic respiration. The next stages, however, differ significantly, and no more ATP beyond the two molecules produced during glycolysis is generated.