Diuretics Acting on the Proximal Tubule

Q-1. Acetazolamide is: (AIIMS Nov 2011)
a) Competitive and reversible carbonic anhydrase inhibitor
b) Non-competitive and reversible carbonic anhydrase inhibitor
c) Competitive and irreversible carbonic anhydrase inhibitor
d) Non-competitive and irreversible carbonic anhydrase inhibitor

Answer: Non-competitive and reversible carbonic anhydrase inhibitor
Explanation:
Carbonic anhydrase inhibitor acts by non-competitive but reversible inhibition of enzyme.
Important point:
Carbonic anhydrase inhibitors- Acetazolamide, Dorzolamide and Brinzolamide