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Catabolic reactions give out energy. They are exergonic. In a catabolic reaction large molecules are broken down into smaller ones. For example, the reverse of the condensation reactions described above, i.e. hydrolysis reactions, are catabolic.
2. Chemical reactions that involve the breakdown of large molecules into smaller molecules are known as catabolic chemical reactions. An example of a catabolic reaction is the reverse of Glycogenesis (the anabolic reaction I told you about earlier). The catabolic reaction involves the breakdown of glycogen into individual glucose molecules.