There are 5 classes of reactions (rxns): Functional Group Addition, Rearranging of Internal Bonds (structural rearrangement), Condensation, Hydrolysis and Energy Transfer.
Condensation (depolymerization) is the breakdown and synthesis of polymers. It is the removal of a H at one end of Molecule A and the removal of OH at one end of Molecule B to produce Molecule C and H2O
Hydrolysis (polymerization, or putting things together) is the separation by inserting H2O to form two molecules.
Molecule C + H2O 
Molecule A + Molecule B
There are four main types of macromolecules: carbohydrates, lipids, proteins and nucleic acids.