Allosteric Enzymes in the Presence of an Inhibitor

An allosteric enzyme has both an active site for its substrate and an allosteric site for an inhibitor of the enzyme. In the absence of enzyme's inhibitor, the substrate is able to bind to the enzyme's active site and end products are produced. If the inhibitor is present, it will bind to the enzyme's allosteric site. This, in turn, alters the enzyme's active site so it can no longer bind its substrate and no end products are produced.

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