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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.
Food energy + ADP + P â ATP. Catabolic reactions generate energy to make ATP, and the ATP energy is used to drive anabolic. reactions, such as metabolic turnover (replacement of cell parts), growth and cell division, and. special functions (such as secretion, absorption, contraction, or signaling).