Question 1

Endospores can be inactivated by

Accepted Answer

A)  dry heat at 170°C for 2 hours.
B)  incineration.
C)  glutaraldehyde for 3 or more hours.
D)  ethylene oxide for 3 or more hours.
E)  All of the choices are correct.F) A) and E)
G) All of the above

Question 2

Isopropyl alcohol wiped across a skin site can sterilize it.

Accepted Answer

A) True 
 B)False

Question 3

Soaps and detergents are very effective as sterilants.

Accepted Answer

A) True 
 B)False

Question 4

Antimicrobial agents can target the cell wall by

Accepted Answer

A)  blocking its synthesis.
B)  digesting it.
C)  denaturing proteins.
D)  All of the choices are correct.E) A) and B)
F) A) and C)

Question 5

All of the following are alkylating control agents except ______.

Accepted Answer

A)  iodophor
B)  propylene oxide
C)  formaldehyde
D)  ethylene oxide
E)  glutaraldehydeF) All of the above
G) A) and B)

Question 6

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 room temperature enhanced the growth of normal biota of the agar.
B)  Air got into the poured agar plates, contaminating them.
C)  The lids of the Petri dishes were inadvertently left on while being sterilized.
D)  The agar had bacteria in it, even after sterilization in the autoclave.E) None of the above
F) C) and D)

Question 7

What instrument is most effective for pressure-temperature sterilization?

Accepted Answer

A)  Water-bath
B)  Autoclave
C)  Incubator
D)  Oven
E)  Bunsen burnerF) C) and D)
G) B) and C)

Question 8

The use of chemical agents directly on exposed body surfaces to destroy or inhibit vegetative pathogens is ______.

Accepted Answer

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

Question 9

Your aim is to sterilize prosthetic devices like heart valves and artificial joint structures before being used in the patient.Considering where they will be placed and the probable composition of the devices, what would be the best chemical to use?

Accepted Answer

A)   Crystal violet dye
B)   Iodine
C)   Quaternary ammonium compounds
D)   BleachE) All of the above
F) A) and B)

Question 10

The process that destroys or removes all microorganisms and microbial forms, including bacterial endospores, on inanimate objects is ______.

Accepted Answer

A)  disinfection
B)  sterilization
C)  antisepsis
D)  sanitization
E)  degermationF) None of the above
G) B) and E)

Question 11

Which is correct regarding the rate of microbial death?

Accepted Answer

A)  Cells die at increasingly greater rates.
B)  Only older cells die in a culture.
C)  Cells in a culture die at a constant rate.
D)  Upon contact with the control agent, all cells die at one time.
E)  Cells become metabolically inactive but are never killed.F) B) and D)
G) A) and C)

Question 12

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 E)
G) B) and D)

Question 13

Prions require more extensive methods of sterilization than are needed for bacterial endospores.

Accepted Answer

A) True 
 B)False

Question 14

Agents that can denature microbial proteins include all of the following except ______.

Accepted Answer

A)  moist heat
B)  alcohol
C)  acids
D)  metallic ions
E)  X raysF) A) and B)
G) C) and E)

Question 15

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)  cytoplasmF) B) and E)
G) A) and B)

Question 16

The presence of organic matter such as saliva and pus can interfere with the actions of disinfectants.

Accepted Answer

A) True 
 B)False

Question 17

Which of the following is an advantage to using phenolics as antimicrobial agents?

Accepted Answer

A)  The presence of organic matter does not limit its antimicrobial qualities.
B)  They are not susceptible to resistance by organisms.
C)  They have low toxicity.
D)  They are effective sterilants against all microbial forms.E) All of the above
F) B) and C)

Question 18

The easiest microbial forms to kill or inhibit are ______.

Accepted Answer

A)  naked viruses
B)  vegetative bacteria and fungi
C)  endospores
D)  protozoan cysts
E)  mycobacteria and staphylococciF) All of the above
G) C) and D)

Question 19

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

Accepted Answer

A)  	in cold temperatures, the energy of activation is not sufficient to drive chemical reactions regardless of the presence 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 controlE) A) and B)
F) All of the above

Question 20

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) A) and B)
F) A) and D)

Exam 11: Physical and Chemical Control of Microbes

The process that destroys or removes all microorganisms and microbial forms, including bacterial endospores, on inanimate objects is ______.

Correct Answer
verified

Soaps and detergents are very effective as sterilants.

Correct Answer
verified

The presence of organic matter such as saliva and pus can interfere with the actions of disinfectants.

Correct Answer
verified

Which of the following is an advantage to using phenolics as antimicrobial agents?

Correct Answer
verified

Isopropyl alcohol wiped across a skin site can sterilize it.

Correct Answer
verified

The easiest microbial forms to kill or inhibit are ______.

Correct Answer
verified

The use of chemical agents directly on exposed body surfaces to destroy or inhibit vegetative pathogens is ______.

Correct Answer
verified

Which is correct regarding the rate of microbial death?

Correct Answer
verified

Your aim is to sterilize prosthetic devices like heart valves and artificial joint structures before being used in the patient.Considering where they will be placed and the probable composition of the devices, what would be the best chemical to use?

Correct Answer
verified

Antimicrobial agents can target the cell wall by

Correct Answer
verified

Correct Answer
verified

Prions require more extensive methods of sterilization than are needed for bacterial endospores.

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

Each of the following is a target of antimicrobial agents except ______.

Correct Answer
verified

What instrument is most effective for pressure-temperature sterilization?

Correct Answer
verified

Endospores can be inactivated by

Correct Answer
verified

Agents that can denature microbial proteins include all of the following except ______.

Correct Answer
verified

All of the following are alkylating control agents except ______.

Correct Answer
verified

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

Correct Answer
verified

Exam 11: Physical and Chemical Control of Microbes

The process that destroys or removes all microorganisms and microbial forms, including bacterial endospores, on inanimate objects is ______.

Correct AnswerverifiedShow Answer

Soaps and detergents are very effective as sterilants.

Correct AnswerverifiedShow Answer

The presence of organic matter such as saliva and pus can interfere with the actions of disinfectants.

Correct AnswerverifiedShow Answer

Which of the following is an advantage to using phenolics as antimicrobial agents?

Correct AnswerverifiedShow Answer

Isopropyl alcohol wiped across a skin site can sterilize it.

Correct AnswerverifiedShow Answer

The easiest microbial forms to kill or inhibit are ______.

Correct AnswerverifiedShow Answer

The use of chemical agents directly on exposed body surfaces to destroy or inhibit vegetative pathogens is ______.

Correct AnswerverifiedShow Answer

Which is correct regarding the rate of microbial death?

Correct AnswerverifiedShow Answer

Your aim is to sterilize prosthetic devices like heart valves and artificial joint structures before being used in the patient.Considering where they will be placed and the probable composition of the devices, what would be the best chemical to use?

Correct AnswerverifiedShow Answer

Antimicrobial agents can target the cell wall by

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Prions require more extensive methods of sterilization than are needed for bacterial endospores.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Each of the following is a target of antimicrobial agents except ______.

Correct AnswerverifiedShow Answer

What instrument is most effective for pressure-temperature sterilization?

Correct AnswerverifiedShow Answer

Endospores can be inactivated by

Correct AnswerverifiedShow Answer

Agents that can denature microbial proteins include all of the following except ______.

Correct AnswerverifiedShow Answer

All of the following are alkylating control agents except ______.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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verified

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