Verified Answer :

Cells regulate enzyme activity through two methods: allosteric inhibition and competitive inhibition. Allosteric inhibition is when something (an ion, an organic chemical, etc..) bonds to a site on the enzyme (not on the active site), and changes the shape of the enzyme. Competitive inhibition is when something (an ion, an organic chemical, etc..) enters the active site so that the true substrate can not enter into the enzyme to have a reaction.

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Answer:Regulatory molecules

Explanation:

Regulatory molecules. Enzymes can be regulated by other molecules that either increase or reduce their activity. Molecules that increase the activity of an enzyme are called activators, while molecules that decrease the activity of an enzyme are called inhibitors.