3. Selman Waksman is credited with the discovery of:
24. The antibacterial activity of tetracyclines is primarily due to:
25. Which tetracycline is most stable in acidic pH
17. Which of the following is not an aminoglycoside?
2. Which of the following terms describes antibiotics produced by microorganisms to inhibit other microorganisms?
5. The term "antibiotic" was first coined by
14. Which β-lactam antibiotic does not contain a fused ring system
13. What is the main difference between penicillins and cephalosporins structurally?
6. The core nucleus of Penicillin is:
28.Tetracyclines degrade in solution by
4. Which of the following antibiotics is derived from actinomycetes?
12. Which of the following antibiotics is most susceptible to acid hydrolysis?
16. Aminoglycosides exert their antibacterial action by:
23. The basic nucleus of tetracyclines consists of
29.Phototoxicity is a known adverse effect of
26.Tetracyclines should not be given with milk because of
30.Which of the following tetracyclines has the longest half-life and best oral absorption
15. Which of the following penicillins is resistant to penicillinase
8. Cephalosporins are derived from:
9. The 4-membered β-lactam ring is highly reactive due to:
22. Kanamycin is obtained from:
7. Which of the following is a monobactam?
21. Streptomycin is ineffective in the treatment of infections caused by:
20. Which of the following is true about the structure of aminoglycosides
1. Who discovered Penicillin in 1928?
27. Which of the following tetracyclines is semisynthetic and has enhanced lipophilicity?
11. The second-generation cephalosporins are more active against:
19. Ototoxicity is a major side effect of which class of antibiotics
18. Which of these aminoglycosides is used orally for bowel sterilization?
10. Clavulanic acid acts as a:
