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metabolism. 1. biotransformation. 2. the sum of the physical and chemical processes by which living organized substance is built up and maintained (anabolism), and by which large molecules are broken down into smaller molecules to make energy available to the organism (catabolism).
Metabolism is the set of chemical rections that occur in a cell, which enable it to keep living, growing and dividing. Metabolic processes are usually classified as: 1  catabolism-obtaining energy and reducing power from nutrients. 2  anabolism-production of new cell components, usually through processes that require energy and reducing power obtained from nutrient catabolism.