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Ethylene oxide


A) is a good antiseptic.
B) is not sporicidal.
C) requires high heat to be effective.
D) is a sterilizing agent.
E) is the active chemical in household bleach.

F) A) and B)
G) B) and D)

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The pH of the medium has no effect on the activity of the disinfectant being applied.

A) True
B) False

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Which of the following disinfectants acts by disrupting the plasma membrane?


A) soaps
B) aldehydes
C) bisphenols
D) halogens
E) heavy metals

F) None of the above
G) A) and B)

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Which of the following is the best method to sterilize heat-labile solutions?


A) dry heat
B) autoclave
C) membrane filtration
D) pasteurization
E) freezing

F) B) and E)
G) A) and D)

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Figure 7.2 Assume 10⁹ E.coli cells/ml are in a flask. Figure 7.2 Assume 10⁹ E.coli cells/ml are in a flask.    -Which graph in Figure 7.2 best depicts the effect of placing the culture in an autoclave for 15 minutes at time x? A) a B) b C) c D) d E) e -Which graph in Figure 7.2 best depicts the effect of placing the culture in an autoclave for 15 minutes at time x?


A) a
B) b
C) c
D) d
E) e

F) B) and C)
G) D) and E)

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Table 7.5 The following results were obtained from a use-dilution test of two disinfectants.Cultures were inoculated into tubes containing varying concentrations of the disinfectants,incubated for 10 min.at 20°C,and then transferred to growth media without disinfectant. (+ = growth;- = no growth) Table 7.5 The following results were obtained from a use-dilution test of two disinfectants.Cultures were inoculated into tubes containing varying concentrations of the disinfectants,incubated for 10 min.at 20°C,and then transferred to growth media without disinfectant. (+ = growth;- = no growth)     -In Table 7.5,which disinfectant is most effective? Against which group of bacteria is Disinfectant A most effective? -In Table 7.5,which disinfectant is most effective? Against which group of bacteria is Disinfectant A most effective?

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Without the actual data from Table 7.5, ...

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Which of the following could be used to sterilize plastic Petri plates in a plastic wrapper?


A) autoclave
B) gamma radiation
C) microwaves
D) sunlight
E) ultraviolet radiation

F) None of the above
G) C) and D)

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