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The six classes of enzymes are as follows:

Oxidoreductase: These accelerate oxidation or reduction reactions (handover of electrons from one molecule to a different.) These reactions are energetic to life and perform a vital part in compulsory metabolic processes e.g. glycolysis.
Transferases: These accelerate the transfer of a functional group (such as methyl) from one molecule to another. The first molecule is called the donor and the second molecule is called the acceptor. These transfer processes are some of the most basic and vital reactions in life.        

: These cause hydrolysis (the procedure of shattering of chemical links with the supplement of water) to take place. There is an extensive assortment of more than two hundred recognized hydrolases; these range from those that disrupt protein to those that split ester bonds.

Lyases:    Lyase enzymes are the ones that produce a double bond and this reaction is carried out by Lyase enzymes. Lysis reactions are the type of elimination reactions that are not hydrolytic or oxidative. Since lysis reactions necessitate only one substrate; this makes Lyases exclusive amid enzymes.

The isomerase enzymes accelerate organizational modifications
inside a molecule; this merely causes an alteration in form as there is simply one substrate as well as one product with nil acquired or mislaid. Inside this group, there are a small number of secondary-sets.

Ligases: Ligation is carried out by ligase enzymes. Ligation takes place when two substrates are linked together. Chemical latent energy is frequently necessary for this reaction to take place; for that reason, it is commonly combined with the hydrolysis of a diphosphate bond.