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Except for some of the originally studied enzymes such as pepsin, rennin, and trypsin, most enzyme names end in ase. The International Union of Biochemistry (I.U.B.) initiated standards of enzyme nomenclature which recommend that enzyme names indicate both the substrate acted upon and the type of reaction catalyzed.xcept for some of the originally studied enzymes such as pepsin, rennin, and trypsin, most enzyme names end in ase. The International Union of Biochemistry (I.U.B.) initiated standards of enzyme nomenclature which recommend that enzyme names indicate both the substrate acted upon and the type of reaction catalyzed.
Generally in an enzyme-catalyzed reaction, the reactant is called  the substrate, which in association with the enzyme forms  the product. + 16 others found this useful.Judy Whitney. Edit.enerally in an enzyme-catalyzed reaction, the reactant is called  the substrate, which in association with the enzyme forms  the product. + 16 others found this useful. Judy Whitney. Edit.