Answer: Allosteric regulation
Explanation: An allosteric site is a site on the enzyme that is different from the enzyme active site. The binding of a molecule to a site different from the active site of enzyme, thus activating the enzyme from its inactive form to its active form is called allosteric regulation. This is a positive allosteric regulation but when the binding of a molecule to a site different from the active site of the enzyme inactivates the enzyme to its inactive for, it is called negative allosteric regulation. Thus allosteric regulation can either be positive or negative.