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Subject - Biochemistry
A metabolism is one of the properties that a living organism must have. It involves the degradation of substances taken up from the environment. The resulting molecules are in turn used to make other substances.
The term metabolism encompasses all of the processes that occur in a lifeform in order to maintain the life processes.
Metabolism is subdivided into catabolism and anabolism. Catabolism includes all of the metabolic pathways that release energy through the degradation of complex molecules (e.g. ). Anabolism includes all of the constructive metabolic reactions that consume energy (e.g. ). Reaction pathways that involve both catabolism and anabolism are termed amphibolic (e.g. citric acid cycle).
In plant physiology, the terms catabolism and anabolism are sometimes replaced with dissimilation/assimilation, where dissimilation usually describes processes that degrade inorganic substances and assimilation usually refers to a metabolic process that makes inorganic substances.
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Cytology is introduced by means of illustrations, animations, and a comprehensive collection of references and selected links.