Multiple Choice Questions on Antimicrobial Agents 1) Which of the following antibiotics acts by inhibiting nucleic acid synthesis? a) Cephalosporin b) Quinolones c) Penicillin d) Sulphonamides 2) Followings are the second-generation quinolones, except? a) Ciprofloxacin b) Enoxacin c) Gatifloxacin d) Ofloxacin 3) Which of the followings are the drug interactions of quinolones is correct? a) Antacids and calcium supplements decrease the absorption of quinolones b) Antacids, and calcium supplements increase absorption of quinolones c) Increased metabolism of warfarin and caffeine d) Quinolones enhance the metabolism of theophylline 4) The mechanism of action of Trimethoprim is: a) Activation of enzyme dihydrofolate reductase b) Activation of enzyme dihydrofolate reductase c) Inhibition of enzyme dihydrofolate reductase d) Inhibition of enzyme dihydropteroate synthetase 5) All of the following combinations are true, except: a) Ciprofloxacin: inhi...