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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 processes are metabolic processes that break down food in the body to create new molecules or provide energy. DNA is constructed from nucleotides in a type of metabolic process known as anabolic. Anabolic processes include the muscle contractions that provide movement in animals.