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It is the process of production of organic acid or alcohol through the reduction of pyruvate produced by glycolysis of sugar (glucose). It occurs in the anaerobic respiration process. It is a substrate-level phosphorylation process where 2 ATP molecules are produced from a single glucose molecule. The end product is either lactic acid or ethanol. These products can’t enter oxidative phosphorylation due to a lack of oxygen. Hence no further ATP molecules are produced. Therefore, it is less effective than the aerobic respiration process in ATP generation.