The reaction can be anabolic
(putting things together) such as combining water and carbon dioxide to for
carbonic acid which is catalyzed by the enzyme carbonic
anhydrase.
They can the catabolic (breaking things apart) such as the cleavage
of the alpha 1,2 glycosidic bond of sucrose to yield glucose and fructose.
The reactions can facilitate the transport of molecules across the plasma membrane
such as the glucose permease does.
The reactions can involve the movement of molecules, vesicles or organelles