LIGASES
LYASES
OXIDO-REDUCTASES
ISOMERASES
HYDROLASES
TRANSFERASES
Rearrange groups within same molecule
Digestive enzymes that breakdown proteins, lipids, sugars etc
Amino, methyl, phosphate group transfer
Join molecules by a covalent bond
Breaks bonds, but is NOT hydrolysis or oxidation eg. decarboxylase
Can catalyze oxidation (adding O2 or removing hydrogen) or reduction (adding hydrogen or removing O2)