Question 1

The alcohol wipe used on a patient's skin before an injection is an example of ______.

Accepted Answer

A)  antisepsis
B)  disinfection
C)  sterilization
D)  decontamination
E)  sanitizationF) B) and C)
G) A) and E)

Question 2

All of the following pertain to hypochlorites except

Accepted Answer

A)  they cause denaturation of enzymes.
B)  they release hypochlorous acid in solution.
C)  they are found in common household bleach.
D)  they are used to disinfect dairy, restaurant, and medical equipment.
E)  they are found in iodophors.F) C) and E)
G) A) and D)

Question 3

When considering time and temperature as factors in microbicidal activity,

Accepted Answer

A)  they are directly proportional to each other.
B)  they are inversely proportional to each other.
C)  they must be of equal value e.g.30 minutes at 30oC.
D)  time is not a factor, only temperature.E) B) and C)
F) A) and B)

Question 4

Which of the following is true regarding the use of osmotic pressure as an antimicrobial agent?

Accepted Answer

A)  Salts and sugars external to a microbe create a hypotonic environment, which causes lysis of the cell.
B)  Salt is an effective solute to create an osmotic pressure gradient outside of a cell; however, the use of sugar, such as in jams and jellies, works via a different mechanism.
C)  Exposing a microbe to a hypertonic environment draws water out of the cell, causing plasmolysis.
D)  Exposing organisms to the air on a benchtop so they completely dry out is an example of using osmotic pressure as a means of microbial control.E) None of the above
F) A) and B)

Question 5

Which of the following forms of radiation are in order from the most penetrating to the least penetrating?

Accepted Answer

A)  Gamma, cathode, X rays
B)  Gamma, X rays, cathode
C)  Cathode, gamma, X ray
D)  X ray, gamma, cathode
E)  Cathode, X ray, gammaF) A) and B)
G) None of the above

Question 6

Ozone is a very effective disinfectant.

Accepted Answer

A) True 
 B)False

Question 7

Which of the following represents microbial control by osmotic pressure?

Accepted Answer

A)  Pickling cucumbers and other vegetables for long-term storage
B)  Placing fruit slices on a drying rack
C)  Canning tomatoes after a summer growing season to use throughout the winter
D)  The crew of the Mayflower using salted meats throughout their voyage to the New WorldE) C) and D)
F) A) and C)

Question 8

The chemical agent/s that produce/s highly reactive hydroxyl-free radicals and also decomposes to O2 gas is ______.

Accepted Answer

A)  hydrogen peroxide
B)  chlorhexidine
C)  iodophors
D)  cationic detergents
E)  CidexF) None of the above
G) A) and B)

Question 9

Which of the following is a disadvantage of dry heat methods such as using a Bunsen burner to incinerate microbes from an inoculating loop and the use of a hot air oven?

Accepted Answer

A)  Bunsen burners and hot air ovens only reach a maximum of 100oC so they are not effective against endospores.
B)  Neither of these methods actually sterilize; they only kill vegetative cells.
C)  Bunsen burners take too long to sterilize and hot air ovens are hazardous for the operators.
D)  Use of an open flame can be dangerous and hot air ovens take much longer to sterilize than autoclaves.E) B) and C)
F) C) and D)

Question 10

Which of the following methods of microbial control is mismatched?

Accepted Answer

A)  Pickling eggs - osmotic pressure
B)  Exposure of surgical equipment to ultraviolet light - radiation
C)  Heating a liquid to 71.6oC for 15 seconds - pasteurization
D)  Autoclaving nutrient agar before pouring into Petri plates - sterilizationE) B) and C)
F) A) and D)

Question 11

The sterilizing gas used in chemiclaves is ______.

Accepted Answer

A)  chlorine dioxide
B)  iodophor
C)  glutaraldehyde
D)  ethylene oxide
E)  formaldehydeF) B) and E)
G) B) and D)

Question 12

Which of the following acids is not used to destroy or inhibit microbial cells in food?

Accepted Answer

A)  Benzoic acid
B)  Acetic acid
C)  Lactic acid
D)  Phosphoric acid
E)  Propionic acidF) A) and C)
G) B) and E)

Question 13

Which of the following items are typically irradiated in order to kill microbes?

Accepted Answer

A)  Cured meats
B)  Human tissues such as heart valves and skin
C)  Operating room air
D)  Surgical gloves
E)  All of the choices are correct.F) C) and D)
G) A) and C)

Question 14

The difference between thermal death time and thermal death point in microbicidal activity is that

Accepted Answer

A)   thermal death time is the greatest amount of time required to kill an organism at a specific temperature, whereas thermal death temperature is the lowest temperature required to kill an organism in 10 minutes.
B)    thermal death time is the shortest amount of time required to kill an organism at a specific temperature, whereas thermal death temperature is the lowest temperature required to kill an organism in 30 minutes.
C)   thermal death time is the shortest amount of time required to kill an organism at a 100oC, whereas thermal death temperature is the lowest temperature required to kill an organism in 10 minutes.
D)   thermal death time is the shortest amount of time required to kill an organism at a specific temperature, whereas thermal death temperature is the lowest temperature required to kill an organism in 10 minutes.E) All of the above
F) B) and C)

Question 15

Using a HEPA filter in a vacuum or furnace is an example of which microbial control method?

Accepted Answer

A)  Surfactant
B)  Gases
C)  Chemical agent
D)   Dry controlE) All of the above
F) B) and C)

Question 16

The method of removing vegetative life forms from living surfaces is termed ______.

Accepted Answer

A)  antisepsis
B)  disinfection
C)  sterilization
D)  decontaminationE) A) and B)
F) A) and D)

Question 17

Hydrogen peroxide is

Accepted Answer

A)  sporicidal.
B)  fungicidal.
C)  bactericidal.
D)  virucidal.
E)  All of the choices are correct.F) A) and B)
G) A) and C)

Question 18

Surgeons preparing for an invasive surgical procedure will scrub their hands thoroughly, and then they use a strong alcohol-based hand sanitizer which renders their hands sterile.

Accepted Answer

A) True 
 B)False

Question 19

All of the following are phenols or phenolics except ______.

Accepted Answer

A)  hexachlorophene
B)  Zephiran
C)  cresols
D)  triclosan
E)  LysolF) A) and E)
G) D) and E)

Question 20

Which of the following is not true of chloramines?

Accepted Answer

A)  They contain chlorine.
B)  They are used to treat wounds and skin surfaces.
C)  They are safer than free chlorine.
D)  They can sanitize and disinfect.
E)  They form trihalomethanes with organic compounds.F) None of the above
G) B) and E)

Exam 11: Physical and Chemical Control of Microbes

Hydrogen peroxide is

Correct AnswerverifiedShow Answer

All of the following are phenols or phenolics except ______.

Correct AnswerverifiedShow Answer

Which of the following methods of microbial control is mismatched?

Correct AnswerverifiedShow Answer

Which of the following is a disadvantage of dry heat methods such as using a Bunsen burner to incinerate microbes from an inoculating loop and the use of a hot air oven?

Correct AnswerverifiedShow Answer

Which of the following represents microbial control by osmotic pressure?

Correct AnswerverifiedShow Answer

Ozone is a very effective disinfectant.

Correct AnswerverifiedShow Answer

Which of the following is true regarding the use of osmotic pressure as an antimicrobial agent?

Correct AnswerverifiedShow Answer

Using a HEPA filter in a vacuum or furnace is an example of which microbial control method?

Correct AnswerverifiedShow Answer

The difference between thermal death time and thermal death point in microbicidal activity is that

Correct AnswerverifiedShow Answer

All of the following pertain to hypochlorites except

Correct AnswerverifiedShow Answer

Surgeons preparing for an invasive surgical procedure will scrub their hands thoroughly, and then they use a strong alcohol-based hand sanitizer which renders their hands sterile.

Correct AnswerverifiedShow Answer

Which of the following items are typically irradiated in order to kill microbes?

Correct AnswerverifiedShow Answer

The alcohol wipe used on a patient's skin before an injection is an example of ______.

Correct AnswerverifiedShow Answer

When considering time and temperature as factors in microbicidal activity,

Correct AnswerverifiedShow Answer

Which of the following is not true of chloramines?

Correct AnswerverifiedShow Answer

Which of the following forms of radiation are in order from the most penetrating to the least penetrating?

Correct AnswerverifiedShow Answer

The chemical agent/s that produce/s highly reactive hydroxyl-free radicals and also decomposes to O2 gas is ______.

Correct AnswerverifiedShow Answer

The method of removing vegetative life forms from living surfaces is termed ______.

Correct AnswerverifiedShow Answer

The sterilizing gas used in chemiclaves is ______.

Correct AnswerverifiedShow Answer

Which of the following acids is not used to destroy or inhibit microbial cells in food?

Correct AnswerverifiedShow Answer

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The chemical agent/s that produce/s highly reactive hydroxyl-free radicals and also decomposes to O₂ gas is ______.

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