Sulfa drugs bind to the active site of the enzyme which normally converts PABA to folic acid,preventing the production of folic acid and,eventually,purine synthesis. In this case,the sulfa drug is acting as a/n
A) allosteric inhibitor
B) competitive inhibitor
C) noncompetitive inhibitor
D) uncompetitive inhibitor

Question

Quizplus · Accepted Answer

A competitive inhibitor is a molecule that binds to the active site of an enzyme and competes with the substrate for binding. In this case, the sulfa drug is binding to the active site of the enzyme, which normally converts PABA to folic acid, and therefore preventing the substrate from binding. As a result, the production of folic acid and purine synthesis is inhibited.

Sulfa Drugs Bind to the Active Site of the Enzyme