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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.
Lesson Summary. Let's review. A biochemical reaction is the interaction of two or more substances to produce another substance. The substances that interact are called reactants, and the substance that is produced is called a product. Biochemical reactions occur in recognizable patterns. One type of reaction is called a synthesis reaction. The opposite of a synthesis reaction is a decomposition reaction. Some biochemical reactions are reversible and referred to as reversible reactions. To unlock this lesson you must be a Study.com Member.