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