ABSTRACT
Enzymes are very powerful catalysts. Many of them can turn over tnore than 10,000 reactant molecules every second. They are also very specific in the type of reaction they catalyse and the reactant molecules (or substrates) with which they react. Redox enzymes (that is, enzymes which catalyse oxidation of reduction reactions) exist to catalyse both simple electron-transfer reactions and the transfer of atoms, or small groups of atoms, to or from a range of substrates.
