IUPAC definition : Macromolecules, mostly of protein nature, that function as (bio)catalysts by increasing
the reaction rates. In general, an enzyme catalyses only one reaction type (reaction
specificity) and operates on only one type of substrate (substrate specificity). Substrate
molecules are attacked at the same site (regiospecificity) and only one or preferentially
one of the enantiomers of chiral substrates or of racemic mixtures is attacked (stereospecificity).;
Macromolecules, mostly of protein nature, that function as (bio)catalysts by increasing
the reaction rates. In general, an enzyme catalyses only one reaction type (reaction
specificity) and operates on only one type of substrate (substrate specificity). Substrate
molecules are attacked at the same site (regiospecificity) and only one or preferentially
one of the enantiomers of chiral substrates or of racemic mixtures is attacked (stereospecificity).