E-PolyLearning

56. Which of the following actions are not affected by antimicrobial agents?
a. cell wall synthesis
b. nucleic acid synthesis
c. protein synthesis
d. capsule formation
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Answer: (d).capsule formation

57. Among the following which one is the most effective method of killing microorganisms?
a. High temperature
b. Low temperature
c. High temperature,high moisture
d. Low temperature,high moisture
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Answer: (c).High temperature,high moisture

58. How much time is required by spores of Clostridium botulinum to be killed by moist heat at 1200C?
a. 2 hours
b. 4 to 20 minutes
c. 24 hours
d. 6-7 hours
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Answer: (b).4 to 20 minutes

59. Vegetative cells are much more sensitive to heat than are spores.
a. True
b. False
c. May be
d. Can't say
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Answer: (a).True

60. Which of the following conditions are required for determination of thermal death time?
a. temperature is varied
b. time is fixed
c. temperature is fixed and time is varied
d. temperature is fixed and time is not selected
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Answer: (c).temperature is fixed and time is varied