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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.
Catabolism refers to chemical reactions that result in the breakdown of more complex organic molecules into simpler substances. Catabolic reactions usually release energy that is used to drive chemical reactions.Anabolism 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. The energy for chemical reactions is stored in ATP. Often when I ask students What is ATP the answer they give is Energy.atabolism refers to chemical reactions that result in the breakdown of more complex organic molecules into simpler substances. Catabolic reactions usually release energy that is used to drive chemical reactions.