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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.
It has two subdivisions: catabolism and anabolism. Catabolism (from the Greek cata, meaning down) consists of all those reactions in which large molecules are broken down into smaller ones, with a release of energy from their chemical bonds.