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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.
All metabolic reactions can be broken down into one of two general categories: catabolic and anabolic reactions. Catabolism is the process by which large molecules are broken down into smaller ones with the release of energy.Anabolism is the process by which energy is used to build up complex molecules needed by the body to maintain itself and develop.atabolism: The process by which large molecules are broken down into smaller ones with the release of energy. Chemical bond: A force of attraction between two atoms. Enzyme: Chemical compounds that act as catalysts, increasing the rate at which reactions take place in a living organism.