Question 1

Which of the following statements is true?

Accepted Answer

A)  A chemical agent with a phenol coefficient of 2.0 is less effective than phenol
B)  The acronym QUATS stands for quaternary aldehyde compounds
C)  The thermal death time for endospores is shorter when moist heat is used than when dry heat is used
D)  Eating irradiated food poses risks of developing cancerE) None of the above
F) All of the above

Question 2

Which of the following is not used as an antiseptic for skin?

Accepted Answer

A)  Ethanol
B)  Iodophor
C)  Formaldehyde
D)  phenol-containing compounds
E)  Hydrogen peroxideF) B) and E)
G) C) and D)

Question 3

Answer true or false to the reason given in the following statement: Ionizing radiation useful because it sterilizes without using heat or chemicals.

Accepted Answer

A) True 
 B)False

Question 4

Which of the following is not susceptible to the effects of surfactants?

Accepted Answer

A)  Non-endospore forming Gram-positive bacteria
B)  Gram-negative bacteria
C)  Non-enveloped viruses
D)  Enveloped viruses
E)  ProtozoansF) B) and C)
G) C) and D)

Question 5

Degerming is best described as

Accepted Answer

A)  A mechanical process for removing microbes
B)  The disinfection of public places
C)  The use of heat to kill microbes in food items
D)  The use of chemical agents to kill microbes
E)  A practice used to maintain a germ-free environmentF) A) and D)
G) C) and D)

Question 6

The microbial death rate associated with antimicrobial agents is

Accepted Answer

A)  Sporadic
B)  Logarithmic
C)  Latent
D)  LinearE) All of the above
F) C) and D)

Question 7

Which of the following is a mismatched pair?

Accepted Answer

A)  Aseptic: pathogen-free environment
B)  Pasteurization: heat to kill pathogens
C)  Bacteriocidal: kills all bacteria
D)  Sterilization: destruction of all forms of microbes
E)  Antisepsis: inanimate objectsF) B) and E)
G) B) and C)

Question 8

Answer true or false to the reason given in the following statement: Oxidative reagents are very effective against infections of deep tissues,because they release hydroxyl radicals which kill anaerobic organisms.

Accepted Answer

A) True 
 B)False

Question 9

Which of the following is used to destroy endospores in a liquid medium that will 	subsequently be used to culture bacteria?

Accepted Answer

A)  Boiling
B)  Pressurized steam
C)  Filtration
D)  Dry heat
E)  PasteurizationF) A) and B)
G) A) and C)

Question 10

Answer true or false to the reason given in the following statement: Because the phospholipid bilayer of plasma membranes is nonpolar,they have hydrophobic and hydrophilic regions.

Accepted Answer

A) True 
 B)False

Question 11

Answer true or false to the reason given in the following statement: Surfactants are very effective for disrupting the plasma membrane of cells because surfactant molecules are oxidants.

Accepted Answer

A) True 
 B)False  False

Question 12

Which of the following is a mismatched pair?

Accepted Answer

A)  Silver nitrate: catheters
B)  Ozone: water treatment
C)  Peracetic acid: food-processing equipment
D)  QUATS: mouthwashes
E)  Ethylene oxide: bed laundryF) A) and E)
G) None of the above

Question 13

Answer true or false to the reason given in the following statement: Hydrogen peroxide is not useful for the treatment of open wounds because the enzyme,lysozyme,which is released from damaged tissues,quickly neutralizes it.

Accepted Answer

A) True 
 B)False

Question 14

Answer true or false to the reason given in the following statement: The death of a microbe such as a bacterium can be hard to identify,because it is difficult to detect DNA synthesis.

Accepted Answer

A) True 
 B)False  False

Question 15

A bacteriostatic agent is one that

Accepted Answer

A)  Kills the microbe
B)  Inhibits the growth of the microbe
C)  Creates static electricity when used
D)  Is chemically unstableE) B) and C)
F) A) and C) B

Question 16

Answer true or false to the reason given in the following statement: The environment in which the microbes to be treated exist is important,because many pathogens will be associated with organic materials such as blood and saliva.

Accepted Answer

A) True 
 B)False

Question 17

Answer true or false to the reason given in the following statement: As the plasma membrane is responsible for enclosing the cytoplasm its loss or damage produces death.

Accepted Answer

A) True 
 B)False

Question 18

Answer true or false to the reason given in the following statement: The flash method of pasteurization is preferable because it is more effective against Staphylococcus and Streptococcus.

Accepted Answer

A) True 
 B)False

Question 19

Which of the following is a mismatched pair?

Accepted Answer

A)  Pasteurization: flash method
B)  Non-ionizing radiation: ultraviolet rays
C)  Freeze-drying: lyophilization
D)  Food preservation: hypotonic medium
E)  Pressurized steam: autoclaveF) D) and E)
G) B) and D)

Question 20

Identify and describe five factors that affect the death of microbes by antimicrobial agents.

Accepted Answer

Five factors affecting microbial death b...

Exam 18: Control of Microbial Growth with Disinfectants and Antiseptics

Which of the following statements is true?

Correct AnswerverifiedShow Answer

Which of the following is not used as an antiseptic for skin?

Correct AnswerverifiedShow Answer

Answer true or false to the reason given in the following statement: Ionizing radiation useful because it sterilizes without using heat or chemicals.

Correct AnswerverifiedShow Answer

Which of the following is not susceptible to the effects of surfactants?

Correct AnswerverifiedShow Answer

Degerming is best described as

Correct AnswerverifiedShow Answer

The microbial death rate associated with antimicrobial agents is

Correct AnswerverifiedShow Answer

Which of the following is a mismatched pair?

Correct AnswerverifiedShow Answer

Answer true or false to the reason given in the following statement: Oxidative reagents are very effective against infections of deep tissues,because they release hydroxyl radicals which kill anaerobic organisms.

Correct AnswerverifiedShow Answer

Which of the following is used to destroy endospores in a liquid medium that will subsequently be used to culture bacteria?

Correct AnswerverifiedShow Answer

Answer true or false to the reason given in the following statement: Because the phospholipid bilayer of plasma membranes is nonpolar,they have hydrophobic and hydrophilic regions.

Correct AnswerverifiedShow Answer

Answer true or false to the reason given in the following statement: Surfactants are very effective for disrupting the plasma membrane of cells because surfactant molecules are oxidants.

Correct AnswerverifiedFalse

Which of the following is a mismatched pair?

Correct AnswerverifiedShow Answer

Answer true or false to the reason given in the following statement: Hydrogen peroxide is not useful for the treatment of open wounds because the enzyme,lysozyme,which is released from damaged tissues,quickly neutralizes it.

Correct AnswerverifiedShow Answer

Answer true or false to the reason given in the following statement: The death of a microbe such as a bacterium can be hard to identify,because it is difficult to detect DNA synthesis.

Correct AnswerverifiedFalse

A bacteriostatic agent is one that

Correct AnswerverifiedB

Answer true or false to the reason given in the following statement: The environment in which the microbes to be treated exist is important,because many pathogens will be associated with organic materials such as blood and saliva.

Correct AnswerverifiedShow Answer

Answer true or false to the reason given in the following statement: As the plasma membrane is responsible for enclosing the cytoplasm its loss or damage produces death.

Correct AnswerverifiedShow Answer

Answer true or false to the reason given in the following statement: The flash method of pasteurization is preferable because it is more effective against Staphylococcus and Streptococcus.

Correct AnswerverifiedShow Answer

Which of the following is a mismatched pair?

Correct AnswerverifiedShow Answer

Identify and describe five factors that affect the death of microbes by antimicrobial agents.

Correct AnswerverifiedFive factors affecting microbial death b...View AnswerShow Answer

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False

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False

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B

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Five factors affecting microbial death b...
View Answer