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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.
Catabolic and Anabolic Reactions. The sum of all chemical reactions within a living organism is known as metabolism. Metabolic pathways are a series of chemical reactions in which the product of one reaction is the substrate for the next reaction.nabolism refers to chemical reactions in which simpler substances are combined to form more complex molecules. Anabolic reactions usually require energy. Anabolic reactions build new molecules and/or store energy. The energy of catabolic reactions is used to drive anabolic reactions.