Question

The sulfa drugs, e.g., sulfanilamide, act:

To inhibit the production of FH4 from dietary folate.
As pseudo-feedback inhibitors of purine nucleotide biosynthesis.
To overcome feedback control of purine nucleotide biosynthesis.
To inhibit single-carbon transfers from tetrahydrofolic acid (FH4).
To inhibit FH4 synthesis de novo in certain bacteria.

Answer 1