enzyme
A macromolecule that functions as a biocatalyst by increasing the
reaction rate, frequently containing or requiring one or more metal
ions. In general, an enzyme catalyzes only one reaction type (reaction
specificity) and operates on only a narrow range of substrates
(substrate specificity). Substrate molecules are attacked at the same
site (regiospecificity) and only one or preferentially one of the
enantiomers of chiral substrate or of racemic mixtures is attacked
(enantiospecificity).
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