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