Metabolism refers to all chemical reactions/transformations in living organisms and in the cells of living organisms to maintain the living state. Through these chemical reactions, living organisms grow and reproduce, maintain the structures, respond to their environments and so on.
Metabolism can be usually classified into two categories: catabolism and anabolism. Catabolism refers to the breaking down of organic matter to release energy by way of cellular respiration. Anabolism refers to the synthesis of all compounds which are useful to cells, including carbohydrates, fats, nucleic acids, proteins, etc. Anabolism usually consumes energy. Living organisms is mostly composed of carbohydrates, fats and proteins. Metabolic reactions work to produce these molecules when need to construct cells and tissues and decompose them as a source of energy.
In metabolism, nutrition from outside is the foundation. Living organisms take in the nutrition and then pathways of metabolism breakdown nutrition to produce energy used for synthesis of new proteins, nucleic acids (DNA, RNA), lipids, etc. The basic metabolic pathways in vastly different species are similar. For instance, carboxylic acids in the citric acid cycle are found in all known living organisms.
Metabolic pathway is composed of a sequence of enzymes in which one chemical is transformed through a series of steps catalyzed by different enzymes into another chemical. As catalysts, enzymes make these reactions act quickly and efficiently in physiological conditions. These enzymes are also the targets in the regulation of metabolic pathways. As a primary manufacturer of recombinant proteins, Creative Biomart provides proteins of several sources, grades and formulations for metabolism research applications.
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