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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.
Answered by The Community. Making the world better, one answer at a time. Anabolic reactions are reactions which build molecules up, catabolic reactions break them down. Since protein synthesis is a 'building' reaction it is anabolic.