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