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Give an account of glycolysis. Where does it occur? What are the end products? Trace the fate of these products in both aerobic and anaerobic respiration.

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Pyruvic acid is formed in the process of glycolysis due to the breakdown of glucose which takes place in the cytoplasm of the cell. This process also involves the partial oxidation of glucose molecules known as the EMP pathway. The important steps involved in the process of glycolysis are as follows:

- Phosphorylation of glucose for the production of glucose-6-phosphate
- Formation of PGAL (Phosphoglyceraldehyde) through the conversion of Fructose-6-phosphate
- The molecules of PGAL are further processed for the production of Pyruvic acid.
- Two molecules of ATP are gained in the process of glycolysis of one glucose molecule

Aerobic Respiration of Pyruvate:
Complete oxidation of Pyruvic acid takes place and carbon dioxide and Energy are produced as a result of this reaction.

Anaerobic Respiration Pyruvate:
In the absence of oxygen,n Anaerobic Respiration takes place, and ethanol and CO2 are produced from the conversion of pyruvic acid. In some organisms that face a complete absence of oxygen, the pyruvic acid can also be converted to lactic acid.

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