An Allosteric Enzyme

An allosteric enzyme:

A) has an active site that binds to the substrate and an allosteric site that binds to the product.
B) allows the movement of molecules and ions from one part of the cell to another.
C) catalyzes both oxidation and reduction reactions.
D) raises a reaction's activation energy so that the rate of the reaction declines.
E) allows a substance other than the substrate to bind to the enzyme, thereby activating or inactivating it.