MICRO 290 Quiz 2 CH 9,10,14,15,16 All
Answered Correct Graded A+ (2025-2026)
Update.
Which of the following microbial control procedures creates pyrimidine dimers in DNA?
a) autoclaving
b) nonionizing radiation
c) ionizing radiation
d) heavy metals - Answer nonionizing radiation
Which of the following items would typically be "sanitized"?
a) surgical utensils
b) milk
c) dishes at home
d) restaurant utensils - Answer restaurant utensils
Which of the following methods will destroy bacterial endospores?
a) sanitization
b) sterilization
c) antisepsis
d) pasteurization - Answer sterilization
_________ organisms are microbes that can survive the heat of pasteurization. - Answer
thermoduric, thermophilic
Surfactants are antimicrobial agents that contain alcohol to make them more effective.
a) true
,a) cellular DNA
b) the cell wall
c) cellular enzymes
d) the viral envelope - Answer the viral envelope
A _________ solution of sugar or salt can preserve honey, jerky, jams, and pickles - Answer
hypertonic
Which of the following organisms would still be present in a solution sterilized by filtration
through a filter with 0.45 µm pores?
a) protozoa
b) viruses
c) yeasts
d) bacteria - Answer viruses
Pure (100%) alcohol is the most effective form of alcohol for use as an antimicrobial agent.
a) true
b) false - Answer false
Which of the following statements concerning autoclaving is INCORRECT?
a) Under 15 psi of pressure, water boils at 121°C.
b) Large volumes or solid substances require longer autoclaving times.
c) Any material that needs to be sterilized should be autoclaved.
d) For an item to be sterilized in an autoclave, steam must contact all of its surfaces. - Answer
Any material that needs to be sterilized should be autoclaved.
Hydrogen peroxide does NOT make a good antiseptic for open wounds because damaged
human cells release _________ which neutralizes hydrogen peroxide. - Answer catalase
, a) true
b) false - Answer true
____________ are infectious proteins that cannot be eliminated by standard sterilizing
techniques.
wrong answer feedback: - Answer prions
__________ filters protect workers from exposure to microbes by creating a barrier of filtered
air across the front of a biological safety cabinet. - Answer HEPA , High-efficiency particulate
air filter
Which of the following statements concerning microbial death is correct?
a) It is a loss of reproductive ability that lasts for 12 to 24 hours.
b) It begins rapidly and then gradually slows until it stops.
c) It is the same for all microbes under all conditions.
d) It can be plotted on a semilogarithmic graph. - Answer It can be plotted on a
semilogarithmic graph.
Soaps and detergents are two common examples of chemicals known as _________ - Answer
surfactants
All of the following microbes are killed by pasteurization EXCEPT __________.
a) E.coli
b) Brucella melitensis
c) Mycobacterium bovis
d) Bacillus stearothermophilus - Answer Bacillus stearothermophilus
Which of the following biosafety levels is characterized by the use of safety cabinets for all
manipulations involving pathogens?
Answered Correct Graded A+ (2025-2026)
Update.
Which of the following microbial control procedures creates pyrimidine dimers in DNA?
a) autoclaving
b) nonionizing radiation
c) ionizing radiation
d) heavy metals - Answer nonionizing radiation
Which of the following items would typically be "sanitized"?
a) surgical utensils
b) milk
c) dishes at home
d) restaurant utensils - Answer restaurant utensils
Which of the following methods will destroy bacterial endospores?
a) sanitization
b) sterilization
c) antisepsis
d) pasteurization - Answer sterilization
_________ organisms are microbes that can survive the heat of pasteurization. - Answer
thermoduric, thermophilic
Surfactants are antimicrobial agents that contain alcohol to make them more effective.
a) true
,a) cellular DNA
b) the cell wall
c) cellular enzymes
d) the viral envelope - Answer the viral envelope
A _________ solution of sugar or salt can preserve honey, jerky, jams, and pickles - Answer
hypertonic
Which of the following organisms would still be present in a solution sterilized by filtration
through a filter with 0.45 µm pores?
a) protozoa
b) viruses
c) yeasts
d) bacteria - Answer viruses
Pure (100%) alcohol is the most effective form of alcohol for use as an antimicrobial agent.
a) true
b) false - Answer false
Which of the following statements concerning autoclaving is INCORRECT?
a) Under 15 psi of pressure, water boils at 121°C.
b) Large volumes or solid substances require longer autoclaving times.
c) Any material that needs to be sterilized should be autoclaved.
d) For an item to be sterilized in an autoclave, steam must contact all of its surfaces. - Answer
Any material that needs to be sterilized should be autoclaved.
Hydrogen peroxide does NOT make a good antiseptic for open wounds because damaged
human cells release _________ which neutralizes hydrogen peroxide. - Answer catalase
, a) true
b) false - Answer true
____________ are infectious proteins that cannot be eliminated by standard sterilizing
techniques.
wrong answer feedback: - Answer prions
__________ filters protect workers from exposure to microbes by creating a barrier of filtered
air across the front of a biological safety cabinet. - Answer HEPA , High-efficiency particulate
air filter
Which of the following statements concerning microbial death is correct?
a) It is a loss of reproductive ability that lasts for 12 to 24 hours.
b) It begins rapidly and then gradually slows until it stops.
c) It is the same for all microbes under all conditions.
d) It can be plotted on a semilogarithmic graph. - Answer It can be plotted on a
semilogarithmic graph.
Soaps and detergents are two common examples of chemicals known as _________ - Answer
surfactants
All of the following microbes are killed by pasteurization EXCEPT __________.
a) E.coli
b) Brucella melitensis
c) Mycobacterium bovis
d) Bacillus stearothermophilus - Answer Bacillus stearothermophilus
Which of the following biosafety levels is characterized by the use of safety cabinets for all
manipulations involving pathogens?
