Enzymes Biological catalysts Specific for a chemical reaction;not used up in that reaction ·Apoenzyme:protein Cofactor:Nonprotein component Coenzyme:Organic cofactor Holoenzyme:Apoenzyme cofactor • Biological catalysts • Specific for a chemical reaction; not used up in that reaction • Apoenzyme: protein • Cofactor: Nonprotein component • Coenzyme: Organic cofactor • Holoenzyme: Apoenzyme + cofactor Enzymes