<unk>  is any chemical process that introduces one or more hydroxyl groups (-OH) into a compound (or radical) thereby oxidizing it. In biochemistry,<unk>  reactions are often facilitated by enzymes called hydroxylases.
Hydroxylation
Carboxylation
Alkylation
Biotinylation
Autoxidation
Glucuronidation
Hydrogenation
Hydrolysis