Question 1

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) B) and D)
G) B) and C)

Question 2

Sterilization is achieved by

Accepted Answer

A)  flash pasteurization.
B)  hot water.
C)  boiling water.
D)  steam autoclave.
E)  All of the choices are correct.F) A) and B)
G) A) and C)

Question 3

Disinfection of beverages such as apple juice,milk,and wine is optimally achieved by

Accepted Answer

A)  pasteurization.
B)  chlorination.
C)  moist heat autoclave.
D)  filtration.
E)  boiling water.F) A) and B)
G) A) and C)

Question 4

Which of the following is not a primary target of milk pasteurization?

Accepted Answer

A)  Salmonella
B)  Campylobacter jejuni
C)  Lactobacillus
D)  Listeria monocytogenes
E)  BrucellaF) B) and C)
G) None of the above

Question 5

Chlorine and ethylene oxide are sterilizing gases.

Accepted Answer

A) True 
 B)False

Question 6

The lowest temperature needed to kill or inactivate all microbes in 10 minutes is the

Accepted Answer

A)  thermal death point (TDP) .
B)  thermal death time (TDT) .
C)  sporicidal time.
D)  death phase point.E) C) and D)
F) B) and C)

Question 7

Scrubbing or immersing the skin in chemicals to reduce the numbers of microbes on the skin is

Accepted Answer

A)  disinfection.
B)  sterilization.
C)  sanitization.
D)  degermation.E) A) and D)
F) A) and C)

Question 8

Which of the following germicides is/are also sporicidal?

Accepted Answer

A)  Betadine
B)  chlorine
C)  phenolics
D)  chlorhexidine
E)  chlorine,chlorhexidine,and BetadineF) All of the above
G) D) and E)

Question 9

Iodophors include

Accepted Answer

A)  chloramines.
B)  betadine.
C)  tincture of iodine.
D)  alcohols.
E)  chlorhexidine.F) B) and C)
G) C) and E)

Question 10

Surfactants work by

Accepted Answer

A)  coating the organism preventing interaction with its environment.
B)  blocking transport into the organism.
C)  blocking transport out from the organism.
D)  disrupting membrane integrity.E) B) and D)
F) None of the above

Question 11

Removal of moisture by dehydration is called

Accepted Answer

A)  desiccation.
B)  flash freeze.
C)  lyophilization.
D)  pasteurization.
E)  sterilization.F) A) and B)
G) All of the above

Question 12

Which of the following is not a heavy metal?

Accepted Answer

A)  tincture of iodine
B)  merthiolate
C)  silver nitrate solution
D)  zinc
E)  mercurochromeF) All of the above
G) A) and D)

Question 13

Pasteurization is used to sterilize milk.

Accepted Answer

A) True 
 B)False

Question 14

You have inherited some old glass baby milk bottles from your grandmother and you would like to use them instead of plastic bottles.The bottles are placed into a large metal container and placed in the oven,at 325 degrees F for about 2 hours.What factor would you change if you wanted the sterilization to occur much quicker?

Accepted Answer

A)  Use a pressure cooker to sterilize the bottles,in steam.
B)  Increase the temperature of the oven by 5 degrees.
C)  Pour an antimicrobial chemical into the bottles before placing into the oven.
D)  Place the bottles outside in the sunlight and then place in the oven.E) A) and D)
F) C) and D)

Question 15

Ozone is a very effective disinfectant.

Accepted Answer

A) True 
 B)False

Question 16

Each of the following is a target of antimicrobial agents except

Accepted Answer

A)  cell walls.
B)  cell membranes.
C)  ribosomes.
D)  cellular proteins.
E)  cytoplasm.F) C) and E)
G) B) and E)

Question 17

_____ is a halogen used in gaseous and liquid form for large scale disinfection of drinking water and sewage.

Accepted Answer

A)  Iodine
B)  Chlorine
C)  Bromine
D)  Fluorine
E)  BetadineF) A) and B)
G) A) and C)

Question 18

You have some old plastic Petri dishes that you would like to use for pouring bacteriological agar plates.The only method of physical sterilization is ultraviolet radiation sterilization with your UV light (you cannot use the autoclave because it will disfigure and melt the plastic) .After sterilizing the plates,pouring the sterilized agar medium,and then leaving the plates out at room temperature for a day or two to let them solidify and dry,you find contaminating bacterial colonies growing on the agar.Predict what has happened in this situation.

Accepted Answer

A)  The agar had bacteria in it,even after sterilization in the autoclave.
B)  The lids of the Petri dishes were inadvertently left on while being sterilized.
C)  The room temperature enhanced the growth of normal biota of the agar.
D)  Air got into the poured agar plates,contaminating them.E) All of the above
F) B) and C)

Question 19

The method of removing vegetative microbial life forms and debris to reduce contamination to safe levels is termed

Accepted Answer

A)  antisepsis.
B)  disinfection.
C)  sterilization.
D)  decontamination.
E)  sanitization.F) B) and D)
G) C) and D)

Question 20

Pasteurization does not inactivate endospores or thermoduric microbes.

Accepted Answer

A) True 
 B)False

Exam 11: Physical and Chemical Control of Microbes

Which of the following germicides is/are also sporicidal?

Correct Answer
verified

Removal of moisture by dehydration is called

Correct Answer
verified

Which of the following is not a primary target of milk pasteurization?

Correct Answer
verified

Pasteurization does not inactivate endospores or thermoduric microbes.

Correct Answer
verified

Chlorine and ethylene oxide are sterilizing gases.

Correct Answer
verified

The lowest temperature needed to kill or inactivate all microbes in 10 minutes is the

Correct Answer
verified

Sterilization is achieved by

Correct Answer
verified

Scrubbing or immersing the skin in chemicals to reduce the numbers of microbes on the skin is

Correct Answer
verified

Which of the following is not a heavy metal?

Correct Answer
verified

_____ is a halogen used in gaseous and liquid form for large scale disinfection of drinking water and sewage.

Correct Answer
verified

Disinfection of beverages such as apple juice,milk,and wine is optimally achieved by

Correct Answer
verified

Iodophors include

Correct Answer
verified

Correct Answer
verified

Each of the following is a target of antimicrobial agents except

Correct Answer
verified

The method of removing vegetative microbial life forms and debris to reduce contamination to safe levels is termed

Correct Answer
verified

Ozone is a very effective disinfectant.

Correct Answer
verified

Surfactants work by

Correct Answer
verified

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

Correct Answer
verified

Pasteurization is used to sterilize milk.

Correct Answer
verified

Correct Answer
verified

Exam 11: Physical and Chemical Control of Microbes

Which of the following germicides is/are also sporicidal?

Correct AnswerverifiedShow Answer

Removal of moisture by dehydration is called

Correct AnswerverifiedShow Answer

Which of the following is not a primary target of milk pasteurization?

Correct AnswerverifiedShow Answer

Pasteurization does not inactivate endospores or thermoduric microbes.

Correct AnswerverifiedShow Answer

Chlorine and ethylene oxide are sterilizing gases.

Correct AnswerverifiedShow Answer

The lowest temperature needed to kill or inactivate all microbes in 10 minutes is the

Correct AnswerverifiedShow Answer

Sterilization is achieved by

Correct AnswerverifiedShow Answer

Scrubbing or immersing the skin in chemicals to reduce the numbers of microbes on the skin is

Correct AnswerverifiedShow Answer

Which of the following is not a heavy metal?

Correct AnswerverifiedShow Answer

_____ is a halogen used in gaseous and liquid form for large scale disinfection of drinking water and sewage.

Correct AnswerverifiedShow Answer

Disinfection of beverages such as apple juice,milk,and wine is optimally achieved by

Correct AnswerverifiedShow Answer

Iodophors include

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Each of the following is a target of antimicrobial agents except

Correct AnswerverifiedShow Answer

The method of removing vegetative microbial life forms and debris to reduce contamination to safe levels is termed

Correct AnswerverifiedShow Answer

Ozone is a very effective disinfectant.

Correct AnswerverifiedShow Answer

Surfactants work by

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Pasteurization is used to sterilize milk.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

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