Question 1

Which antimicrobial method does not sterilize?

Accepted Answer

A)  Ionizing radiation 
B)  Ethylene oxide gas 
C)  Autoclave 
D)  Pasteurization 
A)  Ionizing radiation 
B)  Ethylene oxide gas 
C)  Autoclave 
D)  Pasteurization D

Question 2

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. D

Question 3

Which is correct regarding the rate of microbial death?

Accepted Answer

A)  Cells die at increasingly greater rates. 
B)  Only older cells die in a culture. 
C)  Cells in a culture die at a constant rate. 
D)  Upon contact with the control agent, all cells die at one time. 
E)  Cells become metabolically inactive but are never killed. 
A)  Cells die at increasingly greater rates. 
B)  Only older cells die in a culture. 
C)  Cells in a culture die at a constant rate. 
D)  Upon contact with the control agent, all cells die at one time. 
E)  Cells become metabolically inactive but are never killed. C

Question 4

The sterilizing gas used in chemiclaves is ______.

Accepted Answer

A)  chlorine dioxide 
B)  iodophor 
C)  glutaraldehyde 
D)  ethylene oxide 
E)  formaldehyde 
A)  chlorine dioxide 
B)  iodophor 
C)  glutaraldehyde 
D)  ethylene oxide 
E)  formaldehyde

Question 5

Using a HEPA filter in a vacuum or furnace is an example of which microbial control method?

Accepted Answer

A)  Surfactant 
B)  Gases 
C)  Chemical agent 
D)  Dry control 
A)  Surfactant 
B)  Gases 
C)  Chemical agent 
D)  Dry control

Question 6

Which of the following is not true of chloramines?

Accepted Answer

A)  They contain chlorine. 
B)  They are used to treat wounds and skin surfaces. 
C)  They are safer than free chlorine. 
D)  They can sanitize and disinfect. 
E)  They form trihalomethanes with organic compounds. 
A)  They contain chlorine. 
B)  They are used to treat wounds and skin surfaces. 
C)  They are safer than free chlorine. 
D)  They can sanitize and disinfect. 
E)  They form trihalomethanes with organic compounds.

Question 7

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

Accepted Answer

A) True 
 B)False

Question 8

The alcohol wipe used on a patient's skin before an injection is an example of ______.

Accepted Answer

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

Question 9

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

Accepted Answer

A)  Cured meats 
B)  Human tissues such as heart valves and skin 
C)  Operating room air 
D)  Surgical gloves 
E)  All of the choices are correct. 
A)  Cured meats 
B)  Human tissues such as heart valves and skin 
C)  Operating room air 
D)  Surgical gloves 
E)  All of the choices are correct.

Question 10

Organisms in the genus Pseudomonas are resistant to quats.

Accepted Answer

A) True 
 B)False

Question 11

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 12

Which of the following does not affect microbial nucleic acids?

Accepted Answer

A)  Moist heat 
B)  Ultraviolet light 
C)  X rays 
D)  Ethylene dioxide 
E)  Formaldehyde 
A)  Moist heat 
B)  Ultraviolet light 
C)  X rays 
D)  Ethylene dioxide 
E)  Formaldehyde

Question 13

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

Question 14

_____ radiation excites atoms to a higher energy state within molecules such as DNA,which leads to the formation of pyrimidine dimers.

Accepted Answer

A)  Ultraviolet 
B)  Ionizing 
C)  Infrared 
D)  Gamma 
E)  Particle 
A)  Ultraviolet 
B)  Ionizing 
C)  Infrared 
D)  Gamma 
E)  Particle

Question 15

Which of the following is not a primary target of milk pasteurization?

Accepted Answer

A)  Salmonella 
B)  Campylobacter jejuni 
C)  Lactobacillus 
D)  Listeria monocytogenes 
E)  Brucella 
A)  Salmonella 
B)  Campylobacter jejuni 
C)  Lactobacillus 
D)  Listeria monocytogenes 
E)  Brucella

Question 16

The chemical agent/s that produce/s highly reactive hydroxyl-free radicals and also decomposes to O2 gas is ______.

Accepted Answer

A)  hydrogen peroxide 
B)  chlorhexidine 
C)  iodophors 
D)  cationic detergents 
E)  Cidex 
A)  hydrogen peroxide 
B)  chlorhexidine 
C)  iodophors 
D)  cationic detergents 
E)  Cidex

Question 17

Ozone is a very effective disinfectant.

Accepted Answer

A) True 
 B)False

Question 18

Microbial death occurs when there is

Accepted Answer

A)  no movement. 
B)  no reproduction. 
C)  a change in appearance. 
D)  a decrease in size. 
E)  All of the choices occur. 
A)  no movement. 
B)  no reproduction. 
C)  a change in appearance. 
D)  a decrease in size. 
E)  All of the choices occur.

Question 19

When considering time and temperature as factors in microbicidal activity,

Accepted Answer

A)  they are directly proportional to each other. 
B)  they are inversely proportional to each other. 
C)  they must be of equal value e.g. 30 minutes at 30oC. 
D)  time is not a factor, only temperature. 
A)  they are directly proportional to each other. 
B)  they are inversely proportional to each other. 
C)  they must be of equal value e.g. 30 minutes at 30oC. 
D)  time is not a factor, only temperature.

Question 20

The minimum sterilizing conditions in a steam autoclave are

Accepted Answer

A)  121°C at 15 psi for 15 minutes. 
B)  63°C for 30 minutes. 
C)  100°C for 30 minutes. 
D)  160°C for 2 hours. 
E)  71.6°C for 15 seconds. 
A)  121°C at 15 psi for 15 minutes. 
B)  63°C for 30 minutes. 
C)  100°C for 30 minutes. 
D)  160°C for 2 hours. 
E)  71.6°C for 15 seconds.

Exam 11: Physical and Chemical Control of Microbes

Which antimicrobial method does not sterilize?

Sterilization is achieved by

Which is correct regarding the rate of microbial death?

The sterilizing gas used in chemiclaves is ______.

Using a HEPA filter in a vacuum or furnace is an example of which microbial control method?

Which of the following is not true of chloramines?

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

The alcohol wipe used on a patient's skin before an injection is an example of ______.

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

Organisms in the genus Pseudomonas are resistant to quats.

Which of the following does not affect microbial nucleic acids?

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

_____ radiation excites atoms to a higher energy state within molecules such as DNA,which leads to the formation of pyrimidine dimers.

Which of the following is not a primary target of milk pasteurization?

The chemical agent/s that produce/s highly reactive hydroxyl-free radicals and also decomposes to O2 gas is ______.

Ozone is a very effective disinfectant.

Microbial death occurs when there is

When considering time and temperature as factors in microbicidal activity,

The minimum sterilizing conditions in a steam autoclave are

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

The chemical agent/s that produce/s highly reactive hydroxyl-free radicals and also decomposes to O₂ gas is ______.