E-PolyLearning

41. Which of the following chemotherapeutic agents may affect the growth of Campylobacter jejuni?
a. Vacomycin
b. Polymyxin
c. Trimethoprim
d. None of these
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Answer: (d).None of these

42. To select cholera-causing bacterium, Vibrio cholerae, the pH of the medium is maintained at a pH of
a. 8.5
b. 8.90
c. 6.79
d. 3.5
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Answer: (a).8.5

43. For the selection of endospore-forming bacteria, a mixed culture can be heated at
a. 80°C for 10 minutes
b. 70°C for 10 minutes
c. 60°C for 10 minutes
d. 90°C for 10 minutes
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Answer: (a).80°C for 10 minutes

44. The concentration of agar to obtain semi solid media is
a. 1.5-20%
b. 0.5% or less
c. >10%
d. >10%but<20%
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Answer: (b).0.5% or less

45. Which of the following bacteria dies quickly after drying?
a. Treponema pallidium
b. Mycobacterium tuberculosis
c. Staphylococcus aureus
d. Pseudomonas aeruginosa
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Answer: (a).Treponema pallidium