Question

Which one of them catalyzes oxidation-reduction reactions?

• A. Oxidase
• B. Oxidoreductase
• C. Oxygenase
• D. All of the above

Answer 1

The correct option is D All of the above

Certain enzymes carry oxidation reduction reactions. Oxidation is defined as the chemical process which involves loss of electron whereas reduction is the process in which a substrate accepts electron.
An oxygenase is any enzyme that oxidizes a substrate by transferring the oxygen from molecular oxygen O${}_2$ (as in air) to it.

An oxidoreductase is an enzyme that catalyzes the transfer of electrons from one molecule, the reductant, also called the electron donor, to another, the oxidant, also called the electron acceptor.
An oxidase is any enzyme that catalyzes an oxidation-reduction reaction, especially one involving molecular oxygen (O${}_2$) as the electron acceptor.