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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.
I. Catabolic and Anabolic Reactions. a. Metabolism is the sum of the chemical reactions in an organism. i. Catabolism refers to the energy-releasing processes (degradative, hydrolysis reactions, exergonic).