Enzyme

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).