Question 1

Physical agents for controlling microbial growth include all of the following except ______.

Accepted Answer

A)  ultraviolet radiation
B)  boiling water
C)  pasteurization
D)  hydrogen peroxideE) B) and D)
F) B) and C)

Question 2

A method for sterilizing milk, called _____ treatment, uses 134°C for 1 to 2 seconds.

Accepted Answer

A)  pasteurization
B)  batch pasteurization
C)  flash pasteurization
D)  ultra high temperature
E)   tyndallizationF) A) and D)
G) B) and E)

Question 3

When a control agent targets the metabolic processes of microbial cells, active younger cells typically die more rapidly than older cells.

Accepted Answer

A) True 
 B)False

Question 4

Your friend Joe recently visited the doctor for steroid injections into his knee to reduce swelling due to a previous knee injury.Within a couple of days, he had an infection caused by Pseudomonas, a very pathogenic and drug resistant bacterium.Luckily, Joe went to the doctor immediately and received antibiotics.The doctor tells him that the same problem has occurred to many other people across the United States.Predict the most likely cause of this situation.

Accepted Answer

A)  The steroid was contaminated at the production plant, so all batches of that drug made at that plant were contaminated with the bacterium.
B)  The bacterium is normally on the skin of people, so can easily access the patient's blood during the needle stick.
C)  The staff giving the steroid injections did not use proper aseptic technique.
D)  The needles were re-used and already contaminated before being used on the patients.E) All of the above
F) A) and B)

Question 5

The use of a physical or chemical process to destroy vegetative pathogens on inanimate objects is ______.

Accepted Answer

A)  disinfection
B)  sterilization
C)  antisepsis
D)  sanitization
E)  degermationF) A) and B)
G) C) and D)

Question 6

Microbial death occurs when there is

Accepted Answer

A)  no movement.
B)  no reproduction.
C)  a change in appearance.
D)  a decrease in size.
E)  All of the choices occur.F) B) and E)
G) B) and D)

Question 7

Some microbial control agents are able to _____ cell proteins by breaking bonds that maintain the native state, the three-dimensional configuration of the proteins.

Accepted Answer

A)  mutate
B)  bind
C)  dissolve
D)  denatureE) All of the above
F) B) and D)

Question 8

In lab, inoculating loops are sterilized using ______.

Accepted Answer

A)  chemicals
B)  incineration
C)  filtration
D)  moist heat
E)  gas sterilizationF) A) and D)
G) A) and C)

Question 9

Electrons are ejected from atoms in cells when organisms are exposed to ______.

Accepted Answer

A)  desiccation
B)  ultraviolet light
C)  ethyl alcohol
D)  hydrogen peroxide
E)  gamma rays and X raysF) C) and D)
G) B) and C)

Question 10

Which control method would not be a suitable choice for killing Mycobacterium in a capped culture tube?

Accepted Answer

A)  Ultraviolet (germicidal)  light
B)  Gamma rays
C)  121°C at 15 psi for 15 minutes
D)  160°C for 2 hours
E)  All of the choices are correct.F) B) and C)
G) None of the above

Question 11

Placing organisms at 4oC is ______.

Accepted Answer

A)  bactericidal
B)  bacteriostatic
C)  decontamination
D)  sterilization
E)  germicidalF) A) and C)
G) None of the above

Question 12

Alcohols

Accepted Answer

A)  denature proteins when in a 50-95% alcohol-water solution.
B)  disinfect items when soaking method is utilized.
C)  are skin degerming agents.
D)  at 50% or higher concentrations dissolve cell membrane lipids.
E)  All of the choices are correct.F) A) and D)
G) A) and C)

Question 13

Removal of moisture by dehydration is called ______.

Accepted Answer

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

Question 14

The minimum sterilizing conditions in a steam autoclave are

Accepted Answer

A)  121°C at 15 psi for 15 minutes.
B)  63°C for 30 minutes.
C)  100°C for 30 minutes.
D)  160°C for 2 hours.
E)  71.6°C for 15 seconds.F) A) and D)
G) A) and B)

Question 15

Which of the following does not affect microbial nucleic acids?

Accepted Answer

A)  Moist heat
B)  Ultraviolet light
C)  X rays
D)  Ethylene dioxide
E)  FormaldehydeF) C) and D)
G) A) and D)

Question 16

Vials of microorganisms that undergo the freeze-drying process, called _____, will remain preserved and viable for years.

Accepted Answer

A)  desiccation
B)  flash freeze
C)  lyophilization
D)  pasteurization
E)  sterilizationF) A) and E)
G) C) and E)

Question 17

_____ is a control method that removes microorganisms rather than inhibiting or killing them.

Accepted Answer

A)  Disinfection
B)  Filtration
C)  Boiling
D)  Radiation
E)  SterilizationF) B) and C)
G) None of the above

Question 18

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)  degermationE) None of the above
F) A) and B)

Question 19

Which antimicrobial method does not sterilize?

Accepted Answer

A)   Ionizing radiation
B)   Ethylene oxide gas
C)   Autoclave
D)   PasteurizationE) B) and C)
F) B) and D)

Question 20

The compound that is an organic base containing chlorine and two phenolic rings, and is used increasingly for wound degerming, neonatal washes, hand scrubbing, and prepping surgical skin sites is ______.

Accepted Answer

A)  a quaternary ammonium compound
B)  carbolic acid
C)  triclosan
D)  formalin
E)  chlorhexidineF) A) and C)
G) C) and D)

Exam 11: Physical and Chemical Control of Microbes

When a control agent targets the metabolic processes of microbial cells, active younger cells typically die more rapidly than older cells.

Correct Answer
verified

Placing organisms at 4^oC is ______.

Correct Answer
verified

Physical agents for controlling microbial growth include all of the following except ______.

Correct Answer
verified

A method for sterilizing milk, called _____ treatment, uses 134°C for 1 to 2 seconds.

Correct Answer
verified

Removal of moisture by dehydration is called ______.

Correct Answer
verified

Some microbial control agents are able to _____ cell proteins by breaking bonds that maintain the native state, the three-dimensional configuration of the proteins.

Correct Answer
verified

In lab, inoculating loops are sterilized using ______.

Correct Answer
verified

Microbial death occurs when there is

Correct Answer
verified

The use of a physical or chemical process to destroy vegetative pathogens on inanimate objects is ______.

Correct Answer
verified

Alcohols

Correct Answer
verified

_____ is a control method that removes microorganisms rather than inhibiting or killing them.

Correct Answer
verified

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

Correct Answer
verified

Which control method would not be a suitable choice for killing Mycobacterium in a capped culture tube?

Correct Answer
verified

Electrons are ejected from atoms in cells when organisms are exposed to ______.

Correct Answer
verified

Correct Answer
verified

The minimum sterilizing conditions in a steam autoclave are

Correct Answer
verified

The compound that is an organic base containing chlorine and two phenolic rings, and is used increasingly for wound degerming, neonatal washes, hand scrubbing, and prepping surgical skin sites is ______.

Correct Answer
verified

Which antimicrobial method does not sterilize?

Correct Answer
verified

Which of the following does not affect microbial nucleic acids?

Correct Answer
verified

Vials of microorganisms that undergo the freeze-drying process, called _____, will remain preserved and viable for years.

Correct Answer
verified

Exam 11: Physical and Chemical Control of Microbes

When a control agent targets the metabolic processes of microbial cells, active younger cells typically die more rapidly than older cells.

Correct AnswerverifiedShow Answer

Placing organisms at 4oC is ______.

Correct AnswerverifiedShow Answer

Physical agents for controlling microbial growth include all of the following except ______.

Correct AnswerverifiedShow Answer

A method for sterilizing milk, called _____ treatment, uses 134°C for 1 to 2 seconds.

Correct AnswerverifiedShow Answer

Removal of moisture by dehydration is called ______.

Correct AnswerverifiedShow Answer

Some microbial control agents are able to _____ cell proteins by breaking bonds that maintain the native state, the three-dimensional configuration of the proteins.

Correct AnswerverifiedShow Answer

In lab, inoculating loops are sterilized using ______.

Correct AnswerverifiedShow Answer

Microbial death occurs when there is

Correct AnswerverifiedShow Answer

The use of a physical or chemical process to destroy vegetative pathogens on inanimate objects is ______.

Correct AnswerverifiedShow Answer

Alcohols

Correct AnswerverifiedShow Answer

_____ is a control method that removes microorganisms rather than inhibiting or killing them.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which control method would not be a suitable choice for killing Mycobacterium in a capped culture tube?

Correct AnswerverifiedShow Answer

Electrons are ejected from atoms in cells when organisms are exposed to ______.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

The minimum sterilizing conditions in a steam autoclave are

Correct AnswerverifiedShow Answer

The compound that is an organic base containing chlorine and two phenolic rings, and is used increasingly for wound degerming, neonatal washes, hand scrubbing, and prepping surgical skin sites is ______.

Correct AnswerverifiedShow Answer

Which antimicrobial method does not sterilize?

Correct AnswerverifiedShow Answer

Which of the following does not affect microbial nucleic acids?

Correct AnswerverifiedShow Answer

Vials of microorganisms that undergo the freeze-drying process, called _____, will remain preserved and viable for years.

Correct AnswerverifiedShow Answer

Correct Answer
verified

Placing organisms at 4^oC is ______.

Correct Answer
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