Which sequence correctly represents the bacterial folic acid pathway and the order of the two enzyme targets?

• A. Tetrahydrofolic acid → (enzyme A) → dihydrofolic acid → (enzyme B) → PABA
• B. PABA → (enzyme B) → tetrahydrofolic acid → (enzyme A) → dihydrofolic acid
• C. PABA → (enzyme A) → dihydrofolic acid → (enzyme B) → tetrahydrofolic acid
• D. PABA → dihydrofolic acid → tetrahydrofolic acid → (enzyme A and enzyme B act interchangeably on all steps in a network of redundant enzymes)

Answer: (C)