Question 1

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

Accepted Answer

A)   Chemical agent
B)   Gases
C)   Surfactant
D)   Dry controlE) None of the above
F) C) and D)

Question 2

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)   formalin
B)   carbolic acid
C)   chlorhexidine
D)   triclosan
E)   a quaternary ammonium compoundF) C) and E)
G) D) and E)

Question 3

Most microbial contaminants of food are killed or inactivated at freezing temperatures.

Accepted Answer

A) True 
 B)False

Question 4

Heavy metals work by _______.

Accepted Answer

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

Question 5

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 C)

Question 6

A microorganism that is not motile and has stopped metabolizing is considered dead.

Accepted Answer

A) True 
 B)False

Question 7

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 dis?gure 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 ?nd contaminating bacterial colonies growing on the agar. Predict what has happened in this situation.

Accepted Answer

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

Question 8

_____ radiation excites atoms to a higher energy state within molecules such as DNA, which leads to the formation of pyrimidine dimers.

Accepted Answer

A)   Gamma
B)   Infrared
C)   Ionizing
D)   Particle
E)   UltravioletF) A) and D)
G) None of the above

Question 9

Placing organisms at 4oC is ______.

Accepted Answer

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

Question 10

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

Accepted Answer

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

Question 11

What instrument is most effective for pressure-temperature sterilization?

Accepted Answer

A)   Oven
B)   Autoclave
C)   Bunsen burner
D)   Water-bath
E)   IncubatorF) A) and C)
G) B) and E)

Question 12

_____ 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)   Zinc oxide
C)   Silver nitrate
D)   Triclosan
E)   BetadineF) C) and D)
G) None of the above

Question 13

Which of the following factors will inﬂuence the action of microbial agents?

Accepted Answer

A)   The number of microorganisms
B)   The type of microorganisms present
C)   Temperature and pH
D)   Mode and dosage of the agent
E)   All of the choices will inﬂuence the action.F) A) and D)
G) D) and E)

Question 14

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) C) and E)

Question 15

_____ heat is more rapidly effective and e?cient compared to _____ heat.

Accepted Answer

A)   High; dry
B)   High; moist
C)   Dry; moist
D)   Moist; dry
E)   Moist; highF) B) and C)
G) A) and E)

Question 16

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 325oF 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 with steam
B)   Place the bottles outside in the sunlight and then place in the oven
C)   Pour an antimicrobial chemical into the bottles before placing into the oven
D)   Increase the temperature of the oven by 5 degreesE) A) and B)
F) C) and D)

Question 17

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) B) and E)
G) None of the above

Question 18

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) None of the above
F) All of the above

Question 19

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) A) and E)
G) None of the above

Question 20

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) D) and E)
G) None of the above

Exam 11: Physical and Chemical Control of Microbes

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

Correct Answer
verified

Correct Answer
verified

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

Correct Answer
verified

A microorganism that is not motile and has stopped metabolizing is considered dead.

Correct Answer
verified

_ heat is more rapidly effective and e?cient compared to _ heat.

Correct Answer
verified

The easiest microbial forms to kill or inhibit are ______.

Correct Answer
verified

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

Correct Answer
verified

Most microbial contaminants of food are killed or inactivated at freezing temperatures.

Correct Answer
verified

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

Correct Answer
verified

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

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

Correct Answer
verified

Heavy metals work by _______.

Correct Answer
verified

Which of the following factors will inﬂuence the action of microbial agents?

Correct Answer
verified

Placing organisms at 4^oC is ______.

Correct Answer
verified

_____ radiation excites atoms to a higher energy state within molecules such as DNA, which leads to the formation of pyrimidine dimers.

Correct Answer
verified

Hydrogen peroxide is _______.

Correct Answer
verified

_____ 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 Answer
verified

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

Correct Answer
verified

What instrument is most effective for pressure-temperature sterilization?

Correct Answer
verified

Exam 11: Physical and Chemical Control of Microbes

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

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

A microorganism that is not motile and has stopped metabolizing is considered dead.

Correct AnswerverifiedShow Answer

_____ heat is more rapidly effective and e?cient compared to _____ heat.

Correct AnswerverifiedShow Answer

The easiest microbial forms to kill or inhibit are ______.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Most microbial contaminants of food are killed or inactivated at freezing temperatures.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

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

Correct AnswerverifiedShow Answer

Heavy metals work by _______.

Correct AnswerverifiedShow Answer

Which of the following factors will inﬂuence the action of microbial agents?

Correct AnswerverifiedShow Answer

Placing organisms at 4oC is ______.

Correct AnswerverifiedShow Answer

_____ radiation excites atoms to a higher energy state within molecules such as DNA, which leads to the formation of pyrimidine dimers.

Correct AnswerverifiedShow Answer

Hydrogen peroxide is _______.

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

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

Correct AnswerverifiedShow Answer

What instrument is most effective for pressure-temperature sterilization?

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

_ heat is more rapidly effective and e?cient compared to _ heat.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Placing organisms at 4^oC is ______.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified