Microbiology 250 Exam 3
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1. Which of the following is true about disinfection? E)All of these choices
A)Bacterial endospores may not be killed on an object
B)Fungal spores may not be killed on an object
C)Disinfection reduces the number of pathogenic or-
ganisms on or in an object
D)Disinfection helps reduce the threat of disease
E)All of these choices
2. What is the difference between a disinfectant and an B)Disinfectants are typical-
antiseptic? ly applied to inanimate
A)Disinfectants are typically applied to living tissue and objects and antiseptics are
antiseptics are typically applied to inanimate objects typically applied to living
B)Disinfectants are typically applied to inanimate ob- tissue
jects and antiseptics are typically applied to living tis-
sue
C)Disinfectants sterilize an object, whereas an antisep-
tic does not
D)Antiseptics sterilize and object whereas a disinfec-
tant does not
E)There is no difference between a disinfectant and an
antiseptic
3. It is reported that antimicrobial agent X has a 40% D)78
death rate per minute. If there are 1000 organisms
present in the environment when agent X is applied,
how many organisms will remain in the environment
after 5 minutes?
A)600
B)360
C)130
D)78
E)0
, Microbiology 250 Exam 3
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4. If it was reported that Lysol had a phenol coefficient of C)Lysol was more effective
5.0, this would mean that: than phenol
A)Lysol was less effective than phenol
B)Lysol was equally as effective as phenol
C)Lysol was more effective than phenol
D)All of these choices
E)It is impossible to compare Lysol and phenol because
they have different methods of action
5. Why can liquid dish soap be used as an antimicrobial B)It is a surfactant and dis-
agent, even if it is not labeled as being antibacterial? solves lipids
A)It denatures proteins via hydrolysis reactions
B)It is a surfactant and dissolves lipids
C)It is a mutagen and damages bacterial DNA
D)It is radioactive and causes RNA damage
E)None of these choices
6. Why is phenol considered a good antimicrobial agent? A)Phenol works well in the
A)Phenol works well in the presence of organic mate- presence of organic mate-
rials rials
B)Phenol cannot damage tissue
C)Phenol has a pleasant odor
D)Phenol is used to kill gonococci
E)All of these choices
7. Sanitation: B)Kills microorganisms via
A)Kills microorganisms via ionizing radiation sound waves
B)Kills microorganisms via sound waves
C)Inhibits the growth of microorganisms via ionizing
radiation
D)Inhibits the growth of microorganisms via visible
, Microbiology 250 Exam 3
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light
E)None of these choices
8. Which form of radiation would be most effective at C)Gamma Rays
killing microorganisms?
A)Infrared Light
B)UV light
C)Gamma Rays
D)Visible Light
E)X-rays
9. An agent that inhibits the growth of bacteria is called C)bacteriostatic agent
a/an:
A)antiseptic
B)bactericide
C)bacteriostatic agent
D)sanitizer
10. What is the most susceptible phase of growth for most B)log phase
microorganisms by an antimicrobial agent?
A)lag phase
B)log phase
C)stationary phase
D)death phase
11. Which is not used to measure the effectiveness of an D)Plate count method
antimicrobial agent?
A)Filter paper method
B)Phenol coefficient method
C)Use-dilution method
D)Plate count method
12. B)bactericidal
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1. Which of the following is true about disinfection? E)All of these choices
A)Bacterial endospores may not be killed on an object
B)Fungal spores may not be killed on an object
C)Disinfection reduces the number of pathogenic or-
ganisms on or in an object
D)Disinfection helps reduce the threat of disease
E)All of these choices
2. What is the difference between a disinfectant and an B)Disinfectants are typical-
antiseptic? ly applied to inanimate
A)Disinfectants are typically applied to living tissue and objects and antiseptics are
antiseptics are typically applied to inanimate objects typically applied to living
B)Disinfectants are typically applied to inanimate ob- tissue
jects and antiseptics are typically applied to living tis-
sue
C)Disinfectants sterilize an object, whereas an antisep-
tic does not
D)Antiseptics sterilize and object whereas a disinfec-
tant does not
E)There is no difference between a disinfectant and an
antiseptic
3. It is reported that antimicrobial agent X has a 40% D)78
death rate per minute. If there are 1000 organisms
present in the environment when agent X is applied,
how many organisms will remain in the environment
after 5 minutes?
A)600
B)360
C)130
D)78
E)0
, Microbiology 250 Exam 3
Study online at https://quizlet.com/_ffolfv
4. If it was reported that Lysol had a phenol coefficient of C)Lysol was more effective
5.0, this would mean that: than phenol
A)Lysol was less effective than phenol
B)Lysol was equally as effective as phenol
C)Lysol was more effective than phenol
D)All of these choices
E)It is impossible to compare Lysol and phenol because
they have different methods of action
5. Why can liquid dish soap be used as an antimicrobial B)It is a surfactant and dis-
agent, even if it is not labeled as being antibacterial? solves lipids
A)It denatures proteins via hydrolysis reactions
B)It is a surfactant and dissolves lipids
C)It is a mutagen and damages bacterial DNA
D)It is radioactive and causes RNA damage
E)None of these choices
6. Why is phenol considered a good antimicrobial agent? A)Phenol works well in the
A)Phenol works well in the presence of organic mate- presence of organic mate-
rials rials
B)Phenol cannot damage tissue
C)Phenol has a pleasant odor
D)Phenol is used to kill gonococci
E)All of these choices
7. Sanitation: B)Kills microorganisms via
A)Kills microorganisms via ionizing radiation sound waves
B)Kills microorganisms via sound waves
C)Inhibits the growth of microorganisms via ionizing
radiation
D)Inhibits the growth of microorganisms via visible
, Microbiology 250 Exam 3
Study online at https://quizlet.com/_ffolfv
light
E)None of these choices
8. Which form of radiation would be most effective at C)Gamma Rays
killing microorganisms?
A)Infrared Light
B)UV light
C)Gamma Rays
D)Visible Light
E)X-rays
9. An agent that inhibits the growth of bacteria is called C)bacteriostatic agent
a/an:
A)antiseptic
B)bactericide
C)bacteriostatic agent
D)sanitizer
10. What is the most susceptible phase of growth for most B)log phase
microorganisms by an antimicrobial agent?
A)lag phase
B)log phase
C)stationary phase
D)death phase
11. Which is not used to measure the effectiveness of an D)Plate count method
antimicrobial agent?
A)Filter paper method
B)Phenol coefficient method
C)Use-dilution method
D)Plate count method
12. B)bactericidal
