Enzymes fall into classes based on function
		• There are 6 major classes of enzymes:   1.Oxidoreductases which are involved in oxidation, reduction, and electron or proton transfer reactions;    2.Transferases, catalysing reactions in which groups are transferred;    3.Hydrolases which cleave various covalent bonds by hydrolysis; 4   4.Lyases catalyse reactions forming or breaking double bonds;   5.Isomerases catalyse isomerisation reactions;    6.Ligases join substituents together covalently.