16. The susceptibility of a microorganism to antibiotics and other chemotherapeutic agents can be determined by using

A. tube dilution technique
B. paper disk plate
C. both (a) and (b)
D. none of these

17. Most antibiotics are isolated from

A. viruses
B. aquatic microorganisms
C. soil microorganisms
D. plants

18. Which of the following group is not the carbohydrate-containing antibiotics?

A. Streptomycin & Streptothricin
B. Vancomycin & Moenomycin
C. Everninomycin & Nogirimycin
D. Erythromycin & candicidin

19. The penicillin stable in gastric acid and suitable for oral administration is

A. methicillin
B. carbenicillin
C. cloxacillin
D. penicillin-G

20. Which of the following is not an example of potent antitumor agents?

A. Anthramycin
B. Sibromycin
C. Neothramycin
D. Erythromycin