Microbiology 250 Exam 3: Questions with Complete Solutions Verified for New Updates.
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Course
Microbiology 250
Institution
Microbiology 250
Which of the following is true about disinfection?
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 organisms on or in an object
D)Disinfection helps reduce the threat of disease
E)All of t...
Microbiology 250 Exam 3: Questions with
Complete Solutions Verified for New Updates.
Which of the following is true about disinfection?
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 organisms on or in an object
D)Disinfection helps reduce the threat of disease
E)All of these choices - -✓E)All of these choices
What is the difference between a disinfectant and an antiseptic?
A)Disinfectants are typically applied to living tissue and antiseptics are typically applied to inanimate
objects
B)Disinfectants are typically applied to inanimate objects and antiseptics are typically applied to living
tissue
C)Disinfectants sterilize an object, whereas an antiseptic does not
D)Antiseptics sterilize and object whereas a disinfectant does not
E)There is no difference between a disinfectant and an antiseptic - -✓B)Disinfectants are typically applied
to inanimate objects and antiseptics are typically applied to living tissue
It is reported that antimicrobial agent X has a 40% 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 - -✓D)78
,If it was reported that Lysol had a phenol coefficient of 5.0, this would mean that:
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 - -✓C)Lysol
was more effective than phenol
Why can liquid dish soap be used as an antimicrobial agent, even if it is not labeled as being
antibacterial?
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 - -✓B)It is a surfactant and dissolves lipids
Why is phenol considered a good antimicrobial agent?
A)Phenol works well in the presence of organic materials
B)Phenol cannot damage tissue
C)Phenol has a pleasant odor
D)Phenol is used to kill gonococci
E)All of these choices - -✓A)Phenol works well in the presence of organic materials
Sanitation:
A)Kills microorganisms via ionizing radiation
B)Kills microorganisms via sound waves
C)Inhibits the growth of microorganisms via ionizing radiation
D)Inhibits the growth of microorganisms via visible light
, E)None of these choices - -✓B)Kills microorganisms via sound waves
Which form of radiation would be most effective at killing microorganisms?
A)Infrared Light
B)UV light
C)Gamma Rays
D)Visible Light
E)X-rays - -✓C)Gamma Rays
An agent that inhibits the growth of bacteria is called a/an:
A)antiseptic
B)bactericide
C)bacteriostatic agent
D)sanitizer - -✓C)bacteriostatic agent
What is the most susceptible phase of growth for most microorganisms by an antimicrobial agent?
A)lag phase
B)log phase
C)stationary phase
D)death phase - -✓B)log phase
Which is not used to measure the effectiveness of an antimicrobial agent?
A)Filter paper method
B)Phenol coefficient method
C)Use-dilution method
D)Plate count method - -✓D)Plate count method
When an antimicrobial agent permanently denatures proteins thus preventing renaturation to their
native states it is considered:
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