Question 1

Most microbial contaminants of food are killed at freezing temperatures.

Accepted Answer

A) True 
 B)False

Question 2

Which of the following is not used as an antiseptic?

Accepted Answer

A) iodophor 
B) chlorhexidine 
C) 3% hydrogen peroxide 
D) ethyl alcohol 
E) aqueous glutaraldehyde 
A) iodophor 
B) chlorhexidine 
C) 3% hydrogen peroxide 
D) ethyl alcohol 
E) aqueous glutaraldehyde

Question 3

Isopropyl alcohol wiped across a skin site can sterilize it.

Accepted Answer

A) True 
 B)False

Question 4

For each item listed below, select a sterilant that you feel is the most suitable and effective for that item.Discuss why you selected each sterilant.
A) plastic Petri dishes to be used for nutrient media
B) glass tubes of bacterial cultures to be discarded
C) sterile milk
D) dozens of reusable glass pipets
E) bone tissue for grafting
F) room air
G) hospital mattresses
H) biopsy tissue for histology analysis
I) plastic respiratory therapy equipment and arthroscopes
J) vaccines

Accepted Answer

A) plastic Petri dishes to be used for n

Question 5

Which method of microbial control destroys microorganisms by oxidation of cells?

Accepted Answer

A) steam autoclave 
B) use of glutaraldehyde 
C) use of UV radiation 
D) incineration 
A) steam autoclave 
B) use of glutaraldehyde 
C) use of UV radiation 
D) incineration

Question 6

Discuss the purpose and level of control achieved by pasteurization.Compare the flash and batch methods.

Accepted Answer

Pasteurization is a process used to kill

Question 7

Compare and contrast antisepsis, disinfection, sanitization, and sterilization with regard to techniques used and level of microbial control achieved.

Accepted Answer

Antisepsis, disinfection, sanitization,

Question 8

Endospores can be killed by

Accepted Answer

A) dry heat at 170°C for 2 hours. 
B) incineration. 
C) glutaldehyde for 8 or more hours. 
D) ethylene oxide for 3 or more hours. 
E) All of these choices are correct. 
A) dry heat at 170°C for 2 hours. 
B) incineration. 
C) glutaldehyde for 8 or more hours. 
D) ethylene oxide for 3 or more hours. 
E) All of these choices are correct.

Question 9

All of the following are correct about iodophors, except

Accepted Answer

A) they are complexes of iodine and a neutral polymer. 
B) this formulation allows a quick release of free iodine. 
C) this formulation increases its penetration. 
D) it is less prone to staining or irritating tissue. 
E) a common iodophor is Betadine. 
A) they are complexes of iodine and a neutral polymer. 
B) this formulation allows a quick release of free iodine. 
C) this formulation increases its penetration. 
D) it is less prone to staining or irritating tissue. 
E) a common iodophor is Betadine.

Question 10

Which of the following items are typically irradiated in order to kill microbes?

Accepted Answer

A) ground beef and other meat and poultry 
B) human tissues such as heart valves and skin 
C) operating room air 
D) surgical gloves 
E) All of these choices are correct. 
A) ground beef and other meat and poultry 
B) human tissues such as heart valves and skin 
C) operating room air 
D) surgical gloves 
E) All of these choices are correct.

Question 11

Explain why boiling water is considered disinfection, not a sterilization method.List three materials commonly disinfected by boiling water.

Accepted Answer

Boiling water is considered a disinfecti

Question 12

Alcohols are more effective at inactivating enveloped viruses than naked viruses.

Accepted Answer

A) True 
 B)False

Question 13

Which common hospital pathogen is able to grow abundantly in soap dishes?

Accepted Answer

A) Escherichia coli 
B) Pseudomonas 
C) Hemophilus influenzae 
D) Mycobacteria tuberculosis 
E) Salmonella 
A) Escherichia coli 
B) Pseudomonas 
C) Hemophilus influenzae 
D) Mycobacteria tuberculosis 
E) Salmonella

Question 14

Bacteriocidal agents are sterilants.

Accepted Answer

A) True 
 B)False

Question 15

Which of these metals have antimicrobial properties associated with them?

Accepted Answer

A) Silver 
B) Gold 
C) Tin 
D) Aluminum 
E) both silver and gold 
A) Silver 
B) Gold 
C) Tin 
D) Aluminum 
E) both silver and gold

Question 16

Commercial products containing which types of chemicals are more effective at killing microorganisms?

Accepted Answer

A) bacteriostatic 
B) bacteriocidal 
C) carbohydrate 
D) lead 
A) bacteriostatic 
B) bacteriocidal 
C) carbohydrate 
D) lead

Question 17

Discuss the advantages and disadvantages of irradiating food.Include examples of foods that are irradiated.

Accepted Answer

Irradiating food has several advantages,

Question 18

All of the following pertain to hypochlorites, except

Accepted Answer

A) they release hypochlorous acid in solution. 
B) they cause denaturation of enzymes. 
C) they are found in iodophors. 
D) they are used to disinfect dairy, restaurant, and medical equipment. 
E) they are found in common household bleach. 
A) they release hypochlorous acid in solution. 
B) they cause denaturation of enzymes. 
C) they are found in iodophors. 
D) they are used to disinfect dairy, restaurant, and medical equipment. 
E) they are found in common household bleach.

Question 19

Filtration is an effective method to remove microbes from air and liquids.

Accepted Answer

A) True 
 B)False

Question 20

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

Exam 11: Physical and Chemical Agents for Microbial Control

Most microbial contaminants of food are killed at freezing temperatures.

Which of the following is not used as an antiseptic?

Isopropyl alcohol wiped across a skin site can sterilize it.

Which method of microbial control destroys microorganisms by oxidation of cells?

Discuss the purpose and level of control achieved by pasteurization.Compare the flash and batch methods.

Compare and contrast antisepsis, disinfection, sanitization, and sterilization with regard to techniques used and level of microbial control achieved.

Endospores can be killed by

All of the following are correct about iodophors, except

Which of the following items are typically irradiated in order to kill microbes?

Explain why boiling water is considered disinfection, not a sterilization method.List three materials commonly disinfected by boiling water.

Alcohols are more effective at inactivating enveloped viruses than naked viruses.

Which common hospital pathogen is able to grow abundantly in soap dishes?

Bacteriocidal agents are sterilants.

Which of these metals have antimicrobial properties associated with them?

Commercial products containing which types of chemicals are more effective at killing microorganisms?

Discuss the advantages and disadvantages of irradiating food.Include examples of foods that are irradiated.

All of the following pertain to hypochlorites, except

Filtration is an effective method to remove microbes from air and liquids.

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

The Main Themes of Microbiology

The Chemistry of Biology

Tools of the Laboratory: Methods of Studying Microorganisms

A Survey of Prokaryotic Cells and Microorganisms

A Survey of Eukaryotic Cells and Microorganisms

An Introduction to Viruses

Microbial Nutrition, Ecology, and Growth

An Introduction to Microbial Metabolism: the Chemical Crossroads of Life

Microbial Genetics

Genetic Engineering: a Revolution in Molecular Biology

Drugs, Microbes, Host--The Elements of Chemotherapy

Microbe-Human Interactions: Infection and Disease

An Introduction to Host Defenses and Innate Immunities

Adaptive, Specific Immunity and Immunization

Disorders in Immunity

Procedures for Identifying Pathogens and Diagnosing Infections

The Gram-Positive and Gram-Negative Cocci of Medical Importance

The Gram-Positive Bacilli of Medical Importance

The Gram-Negative Bacilli of Medical Importance

Miscellaneous Bacterial Agents of Disease

The Fungi of Medical Importance

The Parasites of Medical Importance

Introduction to Viruses That Infect Humans: the Dna Viruses

The Rna Viruses That Infect Humans

Environmental Microbiology

Applied and Industrial Microbiology

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