Question 1

The removal of all life forms from inanimate objects is termed ______.

Accepted Answer

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

Question 2

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

Accepted Answer

A)   filtration
B)   chlorination
C)   pasteurization
D)   boiling water
E)   moist heat autoclaveF) A) and C)
G) B) and E)

Question 3

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) A) and C)
F) C) and D)

Question 4

_____ solution was introduced in the late 19th century for preventing gonococcal infections in a newborn's eyes after exposure to the mother's infected birth canal.

Accepted Answer

A)   Merthiolate
B)   Silver nitrate
C)   Triclosan
D)   Zinc oxide
E)   BetadineF) A) and D)
G) B) and D)

Question 5

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) A) and B)
G) B) and D)

Question 6

Isopropyl alcohol wiped across a skin site can sterilize it.

Accepted Answer

A) True 
 B)False

Question 7

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 8

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) B) and E)
G) C) and E)

Question 9

Which of the following is not a factor that affects germicidal activity?

Accepted Answer

A)   Material being treated
B)   Length of exposure
C)   Strength of the germicide
D)   Microorganism being treated
E)   All of the choices are factors.F) A) and E)
G) B) and C)

Question 10

Placing organisms at 4oC is ______.

Accepted Answer

A)   bactericidal
B)   bacteriostatic
C)   decontamination
D)   sterilization
E)   germicidalF) A) and B)
G) C) and D)

Question 11

Heavy metals work by

Accepted Answer

A)   binding to DNA.
B)   mutating DNA.
C)   rupturing the cell membrane.
D)   inactivating proteins.
E)   dissolving the cell wall.F) A) and E)
G) A) and D)

Question 12

Bacteriostatic agents kill bacterial cells.

Accepted Answer

A) True 
 B)False

Question 13

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) A) and B)
F) A) and C)

Question 14

Cold temperatures are considered microbistatic,whereas excessive heat is considered microbicidal.This is due to the fact that irreparable damage.

Accepted Answer

A)   in cold temperatures, the energy of activation is not sufficient to drive chemical reactions regardless of thePresence of enzymes, whereas excessive heat denatures enzymes and/or incinerates the cell causing irreparable damage.
B)   cold temperatures denature enzymes causing irreparable damage to the cell, whereas heat limits the energy of activation available to drive chemical reactions.
C)   cold temperatures freeze and therefore kill the cell, whereas excess heat keeps the cell metabolically active but not dividing.
D)   cold temperatures halt binary fission and is therefore considered a sterilant, whereas heat does not kill spores so it is not an effective method of control.E) A) and B)
F) All of the above

Question 15

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) A) and B)
F) A) and C)

Question 16

Chlorine compounds remain stable and effective in the presence of excess organic matter.

Accepted Answer

A) True 
 B)False

Question 17

Iodophors include ______.

Accepted Answer

A)   betadine
B)   chlorhexidine
C)   alcohols
D)   chloramines
E)   tincture of iodineF) A) and C)
G) A) and B)

Question 18

The use of filtration for sterilization

Accepted Answer

A)   leaves behind endospores.
B)   removes toxins.
C)   uses heat and filtration.
D)   relies on gravity.
E)   can remove viruses.F) B) and E)
G) C) and D)

Question 19

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) A) and D)
G) A) and E)

Question 20

Which of the following is not true of glutaraldehyde?

Accepted Answer

A)   It cross-links proteins on cell surfaces.
B)   It is classified as a carcinogen.
C)   It inactivates endospores in 3 hours.
D)   It inactivates viruses.
E)   It does not damage plastics.F) A) and E)
G) A) and D)

Exam 11: Physical and Chemical Control of Microbes

Placing organisms at 4oC is ______.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Chlorine compounds remain stable and effective in the presence of excess organic matter.

Correct AnswerverifiedShow Answer

Heavy metals work by

Correct AnswerverifiedShow Answer

Isopropyl alcohol wiped across a skin site can sterilize it.

Correct AnswerverifiedShow Answer

The removal of all life forms from inanimate objects is termed ______.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Iodophors include ______.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Bacteriostatic agents kill bacterial cells.

Correct AnswerverifiedShow Answer

Which of the following is not a factor that affects germicidal activity?

Correct AnswerverifiedShow Answer

The use of filtration for sterilization

Correct AnswerverifiedShow Answer

_____ solution was introduced in the late 19th century for preventing gonococcal infections in a newborn's eyes after exposure to the mother's infected birth canal.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following is not true of glutaraldehyde?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Cold temperatures are considered microbistatic,whereas excessive heat is considered microbicidal.This is due to the fact that irreparable damage.

Correct AnswerverifiedShow Answer

Surfactants work by

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following is not a heavy metal?

Correct AnswerverifiedShow Answer

Placing organisms at 4^oC is ______.

Correct Answer
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