Question 1

Which of the following represents the use of osmotic pressure as a microbial control method?

Accepted Answer

A) Exposing dental equipment to UV light 
B) Bleaching a kitchen counter 
C) Salting of meat 
D) Rinsing of a cut with Betadine 
A) Exposing dental equipment to UV light 
B) Bleaching a kitchen counter 
C) Salting of meat 
D) Rinsing of a cut with Betadine C

Question 2

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

Accepted Answer

A) True 
 B)False  True

Question 3

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

Question 4

Chlorine compounds remain stable and effective in the presence of excess organic matter.

Accepted Answer

A) True 
 B)False

Question 5

Which of the following is not a heavy metal?

Accepted Answer

A) Tincture of iodine 
B) Merthiolate 
C) Silver nitrate solution 
D) Zinc 
E) Mercurochrome 
A) Tincture of iodine 
B) Merthiolate 
C) Silver nitrate solution 
D) Zinc 
E) Mercurochrome

Question 6

_____ 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 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

Which of the following is not used as an antiseptic?

Accepted Answer

A) Iodophor 
B) Aqueous glutaraldehyde 
C) 3% hydrogen peroxide 
D) Chlorhexidine 
E) Merthiolate 
A) Iodophor 
B) Aqueous glutaraldehyde 
C) 3% hydrogen peroxide 
D) Chlorhexidine 
E) Merthiolate

Question 9

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

Accepted Answer

A) filtration 
B) chlorination 
C) pasteurization 
D) boiling water 
E) moist heat autoclave 
A) filtration 
B) chlorination 
C) pasteurization 
D) boiling water 
E) moist heat autoclave

Question 10

Intermittent sterilization, which uses 3 days of lower temperature steam for short periods of time, is also called ______.

Accepted Answer

A) pasteurization 
B) incubation 
C) tyndallization 
D) disinfection 
E) desiccation 
A) pasteurization 
B) incubation 
C) tyndallization 
D) disinfection 
E) desiccation

Question 11

Pasteurization is used to sterilize milk.

Accepted Answer

A) True 
 B)False

Question 12

Organisms in the genus Pseudomonas are resistant to quats.

Accepted Answer

A) True 
 B)False

Question 13

_____ solution was introduced in the late 19th century for preventing gonococcal infections in a newborn's eyes after exposure to the mother's infected birth canal.

Accepted Answer

A) Merthiolate 
B) Silver nitrate 
C) Triclosan 
D) Zinc oxide 
E) Betadine 
A) Merthiolate 
B) Silver nitrate 
C) Triclosan 
D) Zinc oxide 
E) Betadine

Question 14

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

Accepted Answer

A) High; dry 
B) High; moist 
C) Dry; moist 
D) Moist; dry 
E) Moist; high 
A) High; dry 
B) High; moist 
C) Dry; moist 
D) Moist; dry 
E) Moist; high

Question 15

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 16

Which of the following factors will influence the action of microbial agents?

Accepted Answer

A) The number of microorganisms 
B) The type of microorganisms present 
C) Temperature and pH 
D) Mode and dosage of the agent 
E) All of the choices will influence the action. 
A) The number of microorganisms 
B) The type of microorganisms present 
C) Temperature and pH 
D) Mode and dosage of the agent 
E) All of the choices will influence the action.

Question 17

Dry heat

Accepted Answer

A) is less efficient than moist heat. 
B) cannot sterilize. 
C) includes tyndallization. 
D) is used in devices called autoclaves. 
E) will sterilize at 121°C for 15 minutes. 
A) is less efficient than moist heat. 
B) cannot sterilize. 
C) includes tyndallization. 
D) is used in devices called autoclaves. 
E) will sterilize at 121°C for 15 minutes.

Question 18

The use of filtration for sterilization

Accepted Answer

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

Question 19

You have inherited some old glass baby milk bottles from your grandmother, and you would like to use them instead of plastic bottles.The bottles are placed into a large metal container and placed in the oven at 325oF for about 2 hours.What factor would you change if you wanted the sterilization to occur much quicker?

Accepted Answer

A)  Place the bottles outside in the sunlight and then place in the oven 
B)  Use a pressure cooker to sterilize the bottles with steam 
C)  Pour an antimicrobial chemical into the bottles before placing into the oven 
D)  Increase the temperature of the oven by 5 degrees 
A)  Place the bottles outside in the sunlight and then place in the oven 
B)  Use a pressure cooker to sterilize the bottles with steam 
C)  Pour an antimicrobial chemical into the bottles before placing into the oven 
D)  Increase the temperature of the oven by 5 degrees

Question 20

Sterilization is achieved by

Accepted Answer

A) flash pasteurization. 
B) hot water. 
C) boiling water. 
D) steam autoclave. 
E) All of the choices are correct. 
A) flash pasteurization. 
B) hot water. 
C) boiling water. 
D) steam autoclave. 
E) All of the choices are correct.

Exam 11: Physical and Chemical Control of Microbes

Which of the following represents the use of osmotic pressure as a microbial control method?

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

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

Chlorine compounds remain stable and effective in the presence of excess organic matter.

Which of the following is not a heavy metal?

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

Pasteurization

Which of the following is not used as an antiseptic?

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

Intermittent sterilization, which uses 3 days of lower temperature steam for short periods of time, is also called ______.

Pasteurization is used to sterilize milk.

Organisms in the genus Pseudomonas are resistant to quats.

_____ solution was introduced in the late 19th century for preventing gonococcal infections in a newborn's eyes after exposure to the mother's infected birth canal.

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

Ethylene oxide is

Which of the following factors will influence the action of microbial agents?

Dry heat

The use of filtration for sterilization

Sterilization is achieved by

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

Microbial Nutrition, Ecology, and Growth

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

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