Microbiology 250 Exam 3 questions with \| \| \| \| \| \|
answers
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 - CORRECT ANSWERS ✔✔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 - CORRECT
\| \| \| \| \| \| \| \| \| \| \| \|
ANSWERS ✔✔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 - CORRECT ANSWERS ✔✔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 - CORRECT ANSWERS ✔✔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 - CORRECT ANSWERS ✔✔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 - CORRECT ANSWERS ✔✔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 - CORRECT ANSWERS ✔✔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 - CORRECT ANSWERS ✔✔C)Gamma Rays
\| \| \| \| \|
An agent that inhibits the growth of bacteria is called a/an:
\| \| \| \| \| \| \| \| \| \|
A)antiseptic
B)bactericide
C)bacteriostatic agent \|
D)sanitizer - CORRECT ANSWERS ✔✔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 - CORRECT ANSWERS ✔✔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 - CORRECT ANSWERS ✔✔D)Plate count method
\| \| \| \| \| \| \| \|
When an antimicrobial agent permanently denatures proteins thus preventing
\| \| \| \| \| \| \| \| \|
renaturation to their native states it is considered: \| \| \| \| \| \| \|
A)bacteriostatic \|
answers
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 - CORRECT ANSWERS ✔✔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 - CORRECT
\| \| \| \| \| \| \| \| \| \| \| \|
ANSWERS ✔✔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 - CORRECT ANSWERS ✔✔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 - CORRECT ANSWERS ✔✔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 - CORRECT ANSWERS ✔✔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 - CORRECT ANSWERS ✔✔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 - CORRECT ANSWERS ✔✔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 - CORRECT ANSWERS ✔✔C)Gamma Rays
\| \| \| \| \|
An agent that inhibits the growth of bacteria is called a/an:
\| \| \| \| \| \| \| \| \| \|
A)antiseptic
B)bactericide
C)bacteriostatic agent \|
D)sanitizer - CORRECT ANSWERS ✔✔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 - CORRECT ANSWERS ✔✔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 - CORRECT ANSWERS ✔✔D)Plate count method
\| \| \| \| \| \| \| \|
When an antimicrobial agent permanently denatures proteins thus preventing
\| \| \| \| \| \| \| \| \|
renaturation to their native states it is considered: \| \| \| \| \| \| \|
A)bacteriostatic \|
