Sulfanilamide and related sulfa drugs were widely used to treat diseases of bacterial origin before penicillin and

Question:

Sulfanilamide and related sulfa drugs were widely used to treat diseases of bacterial origin before penicillin and more advanced drugs were readily available. The inhibitory effect of sulfanilamide on bacterial growth can be reversed by p-aminobenzoate. Suggest a mode of action for sulfanilamide. HN- Sulfanilamide -SO,NH,