Question 1

Pasteurization is used to sterilize milk.

Accepted Answer

A) True 
 B)False

Question 2

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

Question 3

All microbicidal agents are sterilants.

Accepted Answer

A) True 
 B)False

Question 4

Which is mismatched?

Accepted Answer

A)   Merthiolate - silver
B)   Sodium hypochlorite - chlorine
C)   Formalin - formaldehyde
D)   Iodophor - iodine
E)   Benzalkonium chloride - quaternary ammonium compoundF) B) and E)
G) D) and E)

Question 5

All of the following are alkylating control agents except ______.

Accepted Answer

A)   iodophor
B)   propylene oxide
C)   ethylene oxide
D)   glutaraldehyde
E)   formaldehydeF) A) and C)
G) C) and D)

Question 6

Bacteriostatic agents kill bacterial cells.

Accepted Answer

A) True 
 B)False

Question 7

Which of the following is not used as an antiseptic?

Accepted Answer

A)   Chlorhexidine
B)   Iodophor
C)   Merthiolate
D)   3% hydrogen peroxide
E)   Aqueous glutaraldehydeF) A) and C)
G) All of the above

Question 8

When considering time and temperature as factors in microbicidal activity, _______.

Accepted Answer

A)   they are inversely proportional to each other
B)   time is not a factor, only temperature
C)   they must be of equal value e.g. 30 minutes at 30oC
D)   they are directly proportional to each otherE) A) and D)
F) C) and D)

Question 9

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 D)
G) A) and D)

Question 10

Which of the following is not true of chloramines?

Accepted Answer

A)   They form trihalomethanes with organic compounds.
B)   They are safer than free chlorine.
C)   They contain chlorine.
D)   They can sanitize and disinfect.
E)   They are used to treat wounds and skin surfaces.F) A) and B)
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 C)
G) A) and D)

Question 12

Isopropyl alcohol wiped across a skin site can sterilize it.

Accepted Answer

A) True 
 B)False

Question 13

The shortest time required to kill or inactivate all the microbes in a sample at a speciﬁed temperature is called the _______.

Accepted Answer

A)   thermal death point (TDP) 
B)   thermal death time (TDT) 
C)   sporicidal time
D)   death phase pointE) A) and B)
F) None of the above

Question 14

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) All of the above
F) A) and C)

Question 15

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

Question 16

Your aim is to sterilize prosthetic devices like heart valves and arti?cial 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)   Quaternary ammonium compounds
B)   Crystal violet dye
C)   Bleach
D)   IodineE) B) and D)
F) B) and C)

Question 17

All of the following act as surfactants except ______.

Accepted Answer

A)   iodine
B)   detergents
C)   alcohols
D)   quaternary ammonia
E)   soapsF) B) and C)
G) D) and E)

Question 18

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

Accepted Answer

A)   ﬁltration
B)   moist heat autoclave
C)   pasteurization
D)   chlorination
E)   boiling waterF) C) and D)
G) A) and B)

Question 19

Pasteurization _______.

Accepted Answer

A)   kills all vegetative forms
B)   reduces the number of vegetative forms
C)   reduces the number of endospores
D)   increases food nutrient value
E)   is used to sterilize food productsF) A) and B)
G) C) and D)

Question 20

The use of ﬁltration for sterilization _______.

Accepted Answer

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

Exam 11: Physical and Chemical Control of Microbes

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

All of the following act as surfactants except ______.

Correct AnswerverifiedShow Answer

Which of the following is not used as an antiseptic?

Correct AnswerverifiedShow Answer

Pasteurization _______.

Correct AnswerverifiedShow Answer

Antimicrobial agents can target the cell wall by _______.

Correct AnswerverifiedShow Answer

Which is mismatched?

Correct AnswerverifiedShow Answer

Your aim is to sterilize prosthetic devices like heart valves and arti?cial 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

All of the following are alkylating control agents except ______.

Correct AnswerverifiedShow Answer

Isopropyl alcohol wiped across a skin site can sterilize it.

Correct AnswerverifiedShow Answer

Bacteriostatic agents kill bacterial cells.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which is correct regarding the rate of microbial death?

Correct AnswerverifiedShow Answer

Pasteurization is used to sterilize milk.

Correct AnswerverifiedShow Answer

When considering time and temperature as factors in microbicidal activity, _______.

Correct AnswerverifiedShow Answer

Which of the following is not a heavy metal?

Correct AnswerverifiedShow Answer

All microbicidal agents are sterilants.

Correct AnswerverifiedShow Answer

The use of ﬁltration for sterilization _______.

Correct AnswerverifiedShow Answer

The shortest time required to kill or inactivate all the microbes in a sample at a speciﬁed temperature is called the _______.

Correct AnswerverifiedShow Answer

Which of the following is not true of chloramines?

Correct AnswerverifiedShow Answer

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