Question 1

_____ heat is more rapidly effective and efficient compared to _____ heat.

Accepted Answer

The answer of _____ heat is more rapidly effective and...

Question 2

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

Accepted Answer

A)  pasteurization.
B)  chlorination.
C)  moist heat autoclave.
D)  filtration.
E)  boiling water.F) A) and B)
G) B) and D)

Question 3

All the following are correct about detergents, except

Accepted Answer

A)  they are polar molecules that act as surfactants.
B)  the most effective ones are positively charged.
C)  in low concentrations they are bacteriostatic.
D)  they are ineffective against the tuberculosis bacteria.
E)  they are active in the presence of organic matter.F) B) and E)
G) A) and E)

Question 4

Which of the following microbial forms have the highest resistance to physical and chemical controls?

Accepted Answer

A)  naked viruses
B)  protozoan cysts
C)  fungal spores
D)  bacterial endospores
E)  yeastF) C) and D)
G) B) and C)

Question 5

Triclosan, a common ingredient in antimicrobial hand soaps available to consumers, has recently been banned by the FDA (Food and Drug Administration) .All of the following are concerns regarding the use of triclosan, except

Accepted Answer

A)  Scientific evidence does not demonstrate that triclosan-supplemented soaps are any more effective than plain soap and water for hand hygiene.
B)  There are concerns that triclosan may be a hormone disruptor.
C)  Wide spread use of triclosan may favor the survival and growth and of highly resistant bacteria.
D)  Wide spread regular use of triclosan could interfere with the maintenance of healthy normal microbiota.
E)  These are all concerns that have been expressed about triclosan use.There are no exceptions here.F) A) and D)
G) B) and C)

Question 6

_____ filters are widely used to provide a flow of sterile air to hospital rooms.

Accepted Answer

The answer of _____ filters are widely used to provide...

Question 7

The thermal death time for

Accepted Answer

A)  The thermal death time will be longer.
B)  The thermal death time will be shorter.
C)  There will be no change in thermal death time.
D)  There is not enough information to make this prediction.
E)  coli at 63°C was determined to be 20 minutes.Predict the affect on thermal death time if the temperature is increased to 67°C.F) D) and E)
G) B) and D) B

Question 8

Discuss the technique of filtration as a microbial control method, why it's utilized, and specific materials that are filtered.

Accepted Answer

Filtration is a microbial control method that involves passing a liquid or gas through a filter to remove microorganisms. This technique is utilized to ensure the removal of bacteria, viruses, and other microorganisms from liquids and gases, particularly in industries such as pharmaceuticals, food and beverage, and water treatment.

Filtration is an effective method for microbial control because it physically separates microorganisms from the liquid or gas, rather than relying on chemical agents or heat. This makes it a preferred method for preserving the integrity and quality of sensitive materials, such as pharmaceutical products and beverages, where exposure to chemicals or high temperatures could be detrimental.

Specific materials that are commonly filtered include water, air, pharmaceutical products, beverages, and food products. For example, in the pharmaceutical industry, filtration is used to remove bacteria and other contaminants from drug solutions and injectable products. In the food and beverage industry, filtration is utilized to remove microorganisms from juices, beer, and dairy products. In water treatment, filtration is essential for removing bacteria and other pathogens from drinking water.

The materials used for filtration can vary depending on the specific application, but commonly used filter materials include cellulose, activated carbon, ceramic, and membrane filters. These filters are designed to effectively trap and remove microorganisms while allowing the desired liquid or gas to pass through. Overall, filtration is a crucial microbial control method that plays a vital role in ensuring the safety and quality of various products and processes.

Question 9

Which of the following is being used to replace hypochlorites in treating water because of the possibility of cancer-causing substances being produced?

Accepted Answer

A)  hydrogen peroxide
B)  chloramines
C)  fluorine
D)  quaternary ammonium compounds
E)  sodium iodideF) B) and D)
G) A) and D)

Question 10

Moist heat is more efficient at killing microbes and is effective at lower temperatures or shorter exposure times than dry heat.

Accepted Answer

A) True 
 B)False  True

Question 11

Which of the following does not contain a heavy metal?

Accepted Answer

A)  tincture of iodine
B)  merthiolate
C)  silver nitrate solutions
D)  zinc
E)  mercurochromeF) A) and E)
G) B) and C)

Question 12

All of the following are benefits of food irradiation, except

Accepted Answer

A)  it can kill bacterial pathogens on the food.
B)  it can kill insects on the food.
C)  it can inhibit the sprouting of white potatoes.
D)  it can reduce the number of food-borne deaths each year.
E)  it makes the food less nutritious.F) A) and C)
G) A) and B)

Question 13

Which of the following types of agents targets protein conformation?

Accepted Answer

A)  detergents
B)  ultraviolet light
C)  alcohol
D)  hydrogen peroxide
E)  crystal violetF) A) and B)
G) A) and C)

Question 14

All of the following are correct about food irradiation, except

Accepted Answer

A)  food is not made radioactive by the process.
B)  the World Health Organization does not endorse this process.
C)  it is approved in the U.S.for beef, chicken, and pork.
D)  it can lead to a longer shelf life for the irradiated food.
E)  no irradiated food can be sold without clear labeling.F) A) and B)
G) C) and D)

Question 15

Which of the following sequences of DNA would most likely be damaged by UV radiation?

Accepted Answer

A)  AGTACGCAT
B)  AGTTCGCTT
C)  AGAGCGCAT
D)  ATAGAGCGCE) All of the above
F) C) and D)

Question 16

A method for sterilizing milk, called _____ temperature treatment, uses 134°C for 1 to 2 seconds.

Accepted Answer

The answer of A method for sterilizing milk, called _____...

Question 17

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

Accepted Answer

A)  dessication.
B)  ultraviolet light.
C)  ethyl alcohol.
D)  hydrogen peroxide.
E)  gamma rays and X-rays.F) A) and D)
G) A) and C)

Question 18

Which of the following is officially accepted as a sterilant and high-level disinfectant?

Accepted Answer

A)  benzalkonium chloride
B)  silver nitrate
C)  glutaraldehyde
D)  triclosan
E)  cresolF) C) and D)
G) A) and E)

Question 19

Using toilet bowl cleaner and nonionizing radiation on inanimate surfaces only removes or kills vegetative bacteria.The term that best describes this action is

Accepted Answer

A)  sterilization.
B)  disinfection.
C)  antisepsis.
D)  degermation.E) C) and D)
F) B) and C)

Question 20

The process that destroys or removes all microorganisms and microbial forms including bacterial endospores is

Accepted Answer

A)  disinfection.
B)  sterilization.
C)  antisepsis.
D)  sanitization.
E)  degermation.F) A) and E)
G) A) and C)

Exam 11: Physical and Chemical Agents for Microbial Control

_ heat is more rapidly effective and efficient compared to _ heat.

Correct Answer
verified

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

Correct Answer
verified

All the following are correct about detergents, except

Correct Answer
verified

Which of the following microbial forms have the highest resistance to physical and chemical controls?

Correct Answer
verified

Triclosan, a common ingredient in antimicrobial hand soaps available to consumers, has recently been banned by the FDA (Food and Drug Administration) .All of the following are concerns regarding the use of triclosan, except

Correct Answer
verified

_____ filters are widely used to provide a flow of sterile air to hospital rooms.

Correct Answer
verified

The thermal death time for

Correct Answer
verified
B

Discuss the technique of filtration as a microbial control method, why it's utilized, and specific materials that are filtered.

Which of the following is being used to replace hypochlorites in treating water because of the possibility of cancer-causing substances being produced?

Correct Answer
verified

Moist heat is more efficient at killing microbes and is effective at lower temperatures or shorter exposure times than dry heat.

Correct Answer
verified
True

Which of the following does not contain a heavy metal?

Correct Answer
verified

All of the following are benefits of food irradiation, except

Correct Answer
verified

Which of the following types of agents targets protein conformation?

Correct Answer
verified

All of the following are correct about food irradiation, except

Correct Answer
verified

Which of the following sequences of DNA would most likely be damaged by UV radiation?

Correct Answer
verified

A method for sterilizing milk, called _____ temperature treatment, uses 134°C for 1 to 2 seconds.

Correct Answer
verified

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

Correct Answer
verified

Which of the following is officially accepted as a sterilant and high-level disinfectant?

Correct Answer
verified

Using toilet bowl cleaner and nonionizing radiation on inanimate surfaces only removes or kills vegetative bacteria.The term that best describes this action is

Correct Answer
verified

The process that destroys or removes all microorganisms and microbial forms including bacterial endospores is

Correct Answer
verified

Exam 11: Physical and Chemical Agents for Microbial Control

_____ heat is more rapidly effective and efficient compared to _____ heat.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

All the following are correct about detergents, except

Correct AnswerverifiedShow Answer

Which of the following microbial forms have the highest resistance to physical and chemical controls?

Correct AnswerverifiedShow Answer

Triclosan, a common ingredient in antimicrobial hand soaps available to consumers, has recently been banned by the FDA (Food and Drug Administration) .All of the following are concerns regarding the use of triclosan, except

Correct AnswerverifiedShow Answer

_____ filters are widely used to provide a flow of sterile air to hospital rooms.

Correct AnswerverifiedShow Answer

The thermal death time for

Correct AnswerverifiedB

Discuss the technique of filtration as a microbial control method, why it's utilized, and specific materials that are filtered.

Which of the following is being used to replace hypochlorites in treating water because of the possibility of cancer-causing substances being produced?

Correct AnswerverifiedShow Answer

Moist heat is more efficient at killing microbes and is effective at lower temperatures or shorter exposure times than dry heat.

Correct AnswerverifiedTrue

Which of the following does not contain a heavy metal?

Correct AnswerverifiedShow Answer

All of the following are benefits of food irradiation, except

Correct AnswerverifiedShow Answer

Which of the following types of agents targets protein conformation?

Correct AnswerverifiedShow Answer

All of the following are correct about food irradiation, except

Correct AnswerverifiedShow Answer

Which of the following sequences of DNA would most likely be damaged by UV radiation?

Correct AnswerverifiedShow Answer

A method for sterilizing milk, called _____ temperature treatment, uses 134°C for 1 to 2 seconds.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following is officially accepted as a sterilant and high-level disinfectant?

Correct AnswerverifiedShow Answer

Using toilet bowl cleaner and nonionizing radiation on inanimate surfaces only removes or kills vegetative bacteria.The term that best describes this action is

Correct AnswerverifiedShow Answer

The process that destroys or removes all microorganisms and microbial forms including bacterial endospores is

Correct AnswerverifiedShow Answer

_ heat is more rapidly effective and efficient compared to _ heat.

Correct Answer
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Correct Answer
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B

Correct Answer
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True

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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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