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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 reaction and enzymes â Lactose a case study. Background: As you know, enzymes are important molecules because they reduce the activation energy of major chemical reactions in the body. If enzymes were not present chemical reactions in organisms would occur at such low rates that life would not be possible.