There are six types of enzymes based on the sort of reaction they catalyze: 

1. Oxidoreductases: These enzymes catalyze oxidation and reduction reactions in which the electrons travel from one molecule to the other, oxidizing one compound and reducing the other. 
• Example: Pyruvate dehydrogenase, which catalyzes the oxidation of pyruvate to acetyl coenzyme A. 
2. Transferases: Transferases catalyze the transfer of the functional group from a donor molecule to an acceptor molecule.  
• Example: Transaminase, which transfers an amino group from one molecule to another. 
3. Hydrolases: These are hydrolytic enzymes. They catalyze the hydrolysis reaction by adding water to cleave the bond and hydrolyze it.
• Example: Pepsin, which hydrolyzes peptide bonds in proteins. 
4. Lyases:Lyases catalyze the removal of a group from a substrate to create double bonds or it may catalyze the reverse reaction. 
• Example: Aldolase, an enzyme in glycolysis, which catalyzes the reaction in which fructose-1, 6-bisphosphate is split to form glyceraldehyde-3-phosphate and dihydroxyacetone phosphate.
5. Isomerases: These enzymes catalyze the rearrangement of atoms within a molecule, causing the molecule to convert into its isomer. 
• Example: Phosphoglucomutase catalyzes the conversion of glucose-1-phosphate to glucose-6-phosphate. During this reaction, a phosphate group is transferred from one position to another in the same compound.  
6. Ligases:Ligases catalyze the joining together of two separate molecules into one molecular compound, releasing energy during the process. 
• Example: DNA ligase, which forms a phosphodiester bond that joins two fragments of DNA.