E-PolyLearning

66. Which of the following ROS is a powerful oxidizing agent?
a. Superoxide radical
b. Hydrogen peroxide
c. Hydroxyl radical
d. Singlet oxygen
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Answer: (b).Hydrogen peroxide

67. The GasPak system is suitable for which of the following?
a. Aerobic bacteria
b. Anaerobic bacteria
c. Facultatively anaerobic bacteria
d. Microaerophilic bacteria
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Answer: (b).Anaerobic bacteria

68. Which of the following are functions of phosphates used in the preparation of media?
a. they act as buffer
b. source of phosphorous
c. act as “reserve alkali”
d. they act as buffer and is a source of phosphorous
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Answer: (d).they act as buffer and is a source of phosphorous

69. The optimum pH for the growth of most bacteria lies between_______
a. 5-9
b. 6.5-7.5
c. 2-3.5
d. 9-9.5
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Answer: (b).6.5-7.5

70. Growth of bacteria or microorganisms refer to __________________
a. an increase in the size of an individual organism
b. an increase in the mass of an individual organism
c. changes in the total population
d. an increase in number of cells
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Answer: (d).an increase in number of cells