An example of an oxidation-reduction enzyme is dehydrogenase. Dehydrogenase is an enzyme that catalyzes the transfer of electrons from one molecule to another, often using the coenzyme NAD+/NADH. During this transfer, oxidation occurs as the molecule losing electrons becomes more positively charged, while the molecule gaining electrons becomes more negatively charged. This process is known as an oxidation-reduction reaction. In contrast, amylase, protease, and lipase are enzymes that catalyze the breakdown of carbohydrates, proteins, and lipids, respectively, but they do not participate in oxidation-reduction reactions.