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1. In some cases, the cofactor completes the active site of the enzyme or modifies it in such a manner that substrate binding can ensue. 2. The cofactor acts as a donor of electrons or atoms to the substrate and following the reaction is returned to its former state.
The molecules that an enzyme works with are called substrates. The substrates bind to a region on the enzyme called the active site. There are two theories explaining the enzyme-substrate interaction. In the lock-and-key model, the active site of an enzyme is precisely shaped to hold specific substrates.