Question 1

Ethylene oxide is

Accepted Answer

A)  only effective with high heat. 
B)  a halogen. 
C)  the active agent in household bleach. 
D)  used as an antiseptic against anaerobes. 
E)  sporicidal. 
A)  only effective with high heat. 
B)  a halogen. 
C)  the active agent in household bleach. 
D)  used as an antiseptic against anaerobes. 
E)  sporicidal.

Question 2

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

Accepted Answer

A)  antisepsis 
B)  disinfection 
C)  sterilization 
D)  decontamination 
A)  antisepsis 
B)  disinfection 
C)  sterilization 
D)  decontamination

Question 3

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

Accepted Answer

A)  Naked viruses 
B)  Protozoan cysts 
C)  Fungal spores 
D)  Bacterial endospores 
E)  Yeast 
A)  Naked viruses 
B)  Protozoan cysts 
C)  Fungal spores 
D)  Bacterial endospores 
E)  Yeast

Question 4

The process that destroys or removes all microorganisms and microbial forms,including bacterial endospores,on inanimate objects is ______.

Accepted Answer

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

Question 5

The difference between thermal death time and thermal death point in microbicidal activity is that

Accepted Answer

A)  thermal death time is the greatest amount of time required to kill an organism at a specific temperature, whereas thermal death temperature is the lowest temperature required to kill an organism in 10 minutes. 
B)  thermal death time is the shortest amount of time required to kill an organism at a specific temperature, whereas thermal death temperature is the lowest temperature required to kill an organism in 30 minutes. 
C) thermal death time is the shortest amount of time required to kill an organism at a 100oC, whereas thermal death temperature is the lowest temperature required to kill an organism in 10 minutes. 
D)  thermal death time is the shortest amount of time required to kill an organism at a specific temperature, whereas thermal death temperature is the lowest temperature required to kill an organism in 10 minutes. 
A)  thermal death time is the greatest amount of time required to kill an organism at a specific temperature, whereas thermal death temperature is the lowest temperature required to kill an organism in 10 minutes. 
B)  thermal death time is the shortest amount of time required to kill an organism at a specific temperature, whereas thermal death temperature is the lowest temperature required to kill an organism in 30 minutes. 
C) thermal death time is the shortest amount of time required to kill an organism at a 100oC, whereas thermal death temperature is the lowest temperature required to kill an organism in 10 minutes. 
D)  thermal death time is the shortest amount of time required to kill an organism at a specific temperature, whereas thermal death temperature is the lowest temperature required to kill an organism in 10 minutes.

Question 6

Pasteurization does not inactivate endospores or thermoduric microbes.

Accepted Answer

A) True 
 B)False

Question 7

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 products. 
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 products.

Question 8

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

Accepted Answer

A) True 
 B)False

Question 9

HEPA filters are used to remove microbes from

Accepted Answer

A)  air. 
B)  liquids. 
C)  human tissues. 
D)  medical instruments. 
E)  All of the choices are correct. 
A)  air. 
B)  liquids. 
C)  human tissues. 
D)  medical instruments. 
E)  All of the choices are correct.

Question 10

Which of the following forms of radiation are in order from the most penetrating to the least penetrating?

Accepted Answer

A)  Gamma, cathode, X rays 
B)  Gamma, X rays, cathode 
C)  Cathode, gamma, X ray 
D)  X ray, gamma, cathode 
E)  Cathode, X ray, gamma 
A)  Gamma, cathode, X rays 
B)  Gamma, X rays, cathode 
C)  Cathode, gamma, X ray 
D)  X ray, gamma, cathode 
E)  Cathode, X ray, gamma

Question 11

Which of the following methods of microbial control is mismatched?

Accepted Answer

A)  Pickling eggs - osmotic pressure 
B)  Exposure of surgical equipment to ultraviolet light - radiation 
C)  Heating a liquid to 71.6oC for 15 seconds - pasteurization 
D)  Autoclaving nutrient agar before pouring into Petri plates - sterilization 
A)  Pickling eggs - osmotic pressure 
B)  Exposure of surgical equipment to ultraviolet light - radiation 
C)  Heating a liquid to 71.6oC for 15 seconds - pasteurization 
D)  Autoclaving nutrient agar before pouring into Petri plates - sterilization

Question 12

Which of the following acids is not used to destroy or inhibit microbial cells in food?

Accepted Answer

A)  Benzoic acid 
B)  Acetic acid 
C)  Lactic acid 
D)  Phosphoric acid 
E)  Propionic acid 
A)  Benzoic acid 
B)  Acetic acid 
C)  Lactic acid 
D)  Phosphoric acid 
E)  Propionic acid

Question 13

Agents that can denature microbial proteins include all of the following except ______.

Accepted Answer

A)  moist heat 
B)  alcohol 
C)  acids 
D)  metallic ions 
E)  X rays 
A)  moist heat 
B)  alcohol 
C)  acids 
D)  metallic ions 
E)  X rays

Question 14

Which is mismatched?

Accepted Answer

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

Question 15

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

Accepted Answer

A)  pasteurization 
B)  batch pasteurization 
C)  flash pasteurization 
D)  ultra high temperature 
E)  tyndallization 
A)  pasteurization 
B)  batch pasteurization 
C)  flash pasteurization 
D)  ultra high temperature 
E)  tyndallization

Question 16

_____ is a halogen used in gaseous and liquid form for large scale disinfection of drinking water and sewage.

Accepted Answer

A)  Iodine 
B)  Chlorine 
C)  Bromine 
D)  Fluorine 
E)  Betadine 
A)  Iodine 
B)  Chlorine 
C)  Bromine 
D)  Fluorine 
E)  Betadine

Question 17

The lowest temperature needed to kill or inactivate all microbes in 10 minutes is the

Accepted Answer

A)  thermal death point (TDP). 
B)  thermal death time (TDT). 
C)  sporicidal time. 
D)  death phase point. 
A)  thermal death point (TDP). 
B)  thermal death time (TDT). 
C)  sporicidal time. 
D)  death phase point.

Question 18

All of the following are alkylating control agents except ______.

Accepted Answer

A)  iodophor 
B)  propylene oxide 
C)  formaldehyde 
D)  ethylene oxide 
E)  glutaraldehyde 
A)  iodophor 
B)  propylene oxide 
C)  formaldehyde 
D)  ethylene oxide 
E)  glutaraldehyde

Question 19

Aniline dyes like crystal violet have antimicrobial activity particularly against gram-positive bacteria and some fungi.

Accepted Answer

A) True 
 B)False

Question 20

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

Exam 11: Physical and Chemical Control of Microbes

Ethylene oxide is

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

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

The process that destroys or removes all microorganisms and microbial forms,including bacterial endospores,on inanimate objects is ______.

The difference between thermal death time and thermal death point in microbicidal activity is that

Pasteurization does not inactivate endospores or thermoduric microbes.

Pasteurization

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

HEPA filters are used to remove microbes from

Which of the following forms of radiation are in order from the most penetrating to the least penetrating?

Which of the following methods of microbial control is mismatched?

Which of the following acids is not used to destroy or inhibit microbial cells in food?

Agents that can denature microbial proteins include all of the following except ______.

Which is mismatched?

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

_____ is a halogen used in gaseous and liquid form for large scale disinfection of drinking water and sewage.

The lowest temperature needed to kill or inactivate all microbes in 10 minutes is the

All of the following are alkylating control agents except ______.

Aniline dyes like crystal violet have antimicrobial activity particularly against gram-positive bacteria and some fungi.

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

The Main Themes of Microbiology

The Chemistry of Biology

Tools of the Laboratory: Methods for the Culturing of Microscopic Analysis of Microorganisms

Bacteria and Archaea

Eukaryotic Cells and Microorganisms

An Introduction to the Viruses

Host Defenses II: Specific Immunity and Immunization

Microbial Metabolism: The Chemical Crossroads of Life

Microbial Genetics

Genetic Engineering and Recombinant Dna

Antimicrobial Treatment

Microbe-Human Interactions: Health and Disease

Host Defenses I: Overview and Nonspecific Defenses

Host Defenses II: Specific Immunity and Immunization

Disorders in Immunity

Diagnosing Infections

Infectious Diseases Affecting the Skin and Eyes

Infectious Diseases Affecting the Nervous System

Infectious Diseases Affecting the Cardiovascular and Lymphatic Systems

Infectious Diseases Affecting the Respiratory System

Infectious Diseases Affecting the Gastrointestinal Tract

Infectious Diseases Affecting the Genitourinary System

Microbes and the Environment

Applied Microbiology and Food and Water Safety

Filters