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enzyme 音标拼音: ['ɛnz ,ɑɪm] n. 酶 □ enzyme n 1: any of several complex proteins that are produced by cells and act as catalysts in specific biochemical reactionsenzyme \ en" zyme\ ([ e^] n" z[ imac] m), n. [ Pref. en- ( Gr. ' en in) Gr. zy` mh leaven.] ( Physiol. Chem.) A protein produced by a living organism, capable of catalyzing a chemical reaction. Almost all processes in living organisms require some form of enzyme to cause the reactions to occur at a rate sufficient to support life. There are a very wide variety of enzymes, each specifically catalyzing a different chemical reaction, the sum of which cause the bulk of the physiological changes observed as life processes. Enzymes, like most proteins, are synthesized by the protein- synthetic mechanism of the living cell, at special sites on ribosomes, using the genetic information in messenger RNA transcribed from the genetic instructions stored as nuleotide sequences in the DNA ( or in some viruses, the RNA) of the genome. Some examples of enzymes are: pepsin, diastase, rennet, DNA polymerase, invertase, glucose oxidase, protease, and ribonuclease. There are many other types of enzyme. [ 1913 Webster PJC] Note: The 1913 Webster defined an enzyme as: An unorganized or unformed ferment, in distinction from an organized or living ferment; a soluble, or chemical, ferment. [ PJC] 19 Moby Thesaurus words for " enzyme": beta- amylase, carbohydrase, coenzyme, deoxyribonuclease, digestant, digester, digestive, esterase, holoenzyme, insulinase, lipase, lipoxidase, pepsin, polynucleotidase, protease, proteolytic enzyme, ribonuclease, saccharase, saccharifying enzyme
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