Question 1

Which is true of iodine?

Accepted Answer

A)  It does not readily kill endospores. 
B)  It may be used as an antiseptic or as a disinfectant. 
C)  It is important to use it at the recommended dilution. 
D)  It is usually found as tinctures or iodophors. 
E)  All of the choices are true. 
A)  It does not readily kill endospores. 
B)  It may be used as an antiseptic or as a disinfectant. 
C)  It is important to use it at the recommended dilution. 
D)  It is usually found as tinctures or iodophors. 
E)  All of the choices are true.

Question 2

Dry heat takes a much shorter time to sterilize material than wet heat.

Accepted Answer

A) True 
 B)False

Question 3

Which of the following methods sterilize the materials?

Accepted Answer

A)  Pasteurization 
B)  High-temperature-short-time pasteurization (HTST) 
C)  Ultrahigh-temperature (UHT) method 
D)  None of these are sterilization methods 
A)  Pasteurization 
B)  High-temperature-short-time pasteurization (HTST) 
C)  Ultrahigh-temperature (UHT) method 
D)  None of these are sterilization methods

Question 4

Typical conditions used for sterilization are

Accepted Answer

A)  100°C for 10 minutes. 
B)  121°C at 15 psi for 15 minutes. 
C)  80°C for 15 minutes. 
D)  72°C for 15 seconds. 
A)  100°C for 10 minutes. 
B)  121°C at 15 psi for 15 minutes. 
C)  80°C for 15 minutes. 
D)  72°C for 15 seconds.

Question 5

A suffix used to describe a killing action would be

Accepted Answer

A)  -static. 
B)  -cidal. 
C)  -cillin. 
D)  -tion. 
A)  -static. 
B)  -cidal. 
C)  -cillin. 
D)  -tion.

Question 6

Hexachlorophene has been particularly effective against

Accepted Answer

A)  Staphylococcus aureus. 
B)  Micrococcus aureus. 
C)  Escherichia coli. 
D)  Enterobacter aerogenes. 
A)  Staphylococcus aureus. 
B)  Micrococcus aureus. 
C)  Escherichia coli. 
D)  Enterobacter aerogenes.

Question 7

Upon heat treatment, bacteria die at a constant proportion.

Accepted Answer

A) True 
 B)False

Question 8

Boiling is very effective at removing most common waterborne pathogens.

Accepted Answer

A) True 
 B)False

Question 9

Cold and freezing are very effective in killing bacteria.

Accepted Answer

A) True 
 B)False

Question 10

If a process kills 90% of the organisms per minute, how many minutes would it take to kill all organisms when starting with 100,000 organisms?

Accepted Answer

A)  1 minute 
B)  2 minutes 
C)  3 minutes 
D)  6 minutes 
A)  1 minute 
B)  2 minutes 
C)  3 minutes 
D)  6 minutes

Question 11

Lister developed his ideas on prevention of infection during medical procedures after studying the work of

Accepted Answer

A)  Koch. 
B)  Pasteur. 
C)  Jenner. 
D)  Fleming. 
A)  Koch. 
B)  Pasteur. 
C)  Jenner. 
D)  Fleming.

Question 12

Gamma irradiation

Accepted Answer

A)  has not been approved for use on food. 
B)  can be used to either sterilize or pasteurize, depending on the dose of radiation. 
C)  leaves some radioactive particles in the treated substance. 
D)  usually kills by disrupting cell membranes. 
A)  has not been approved for use on food. 
B)  can be used to either sterilize or pasteurize, depending on the dose of radiation. 
C)  leaves some radioactive particles in the treated substance. 
D)  usually kills by disrupting cell membranes.

Question 13

Moist heat kills microorganisms by

Accepted Answer

A)  irreversible coagulation of proteins. 
B)  destruction of carbohydrates in the cell wall. 
C)  denaturation of nucleic acids. 
D)  dissolving the capsule. 
A)  irreversible coagulation of proteins. 
B)  destruction of carbohydrates in the cell wall. 
C)  denaturation of nucleic acids. 
D)  dissolving the capsule.

Question 14

Which of the following is true of hydrogen peroxide?

Accepted Answer

A)  It is a sterilant for inanimate objects and is quickly inactivated on living tissue. 
B)  It leaves a toxic residue. 
C)  It is broken down by catalase into water and oxygen. 
D)  It is even more effective when used in combination with peracetic acid. 
E)  It is a sterilant for inanimate objects and is quickly inactivated on living tissue; it is broken down by catalase into water and oxygen AND it is even more effective when used in combination with peracetic acid. 
A)  It is a sterilant for inanimate objects and is quickly inactivated on living tissue. 
B)  It leaves a toxic residue. 
C)  It is broken down by catalase into water and oxygen. 
D)  It is even more effective when used in combination with peracetic acid. 
E)  It is a sterilant for inanimate objects and is quickly inactivated on living tissue; it is broken down by catalase into water and oxygen AND it is even more effective when used in combination with peracetic acid.

Question 15

Commercial canning processes

Accepted Answer

A)  are geared to destroy Clostridium botulinum spores. 
B)  kill all endospores. 
C)  are especially needed on low acid foods. 
D)  are 12D processes (designed to kill 1012 endospores). 
E)  are geared to destroy Clostridium botulinum spores, are especially needed on low acid foods, AND are 12D (designed to kill 1012 endospores) processes. 
A)  are geared to destroy Clostridium botulinum spores. 
B)  kill all endospores. 
C)  are especially needed on low acid foods. 
D)  are 12D processes (designed to kill 1012 endospores). 
E)  are geared to destroy Clostridium botulinum spores, are especially needed on low acid foods, AND are 12D (designed to kill 1012 endospores) processes.

Question 16

One of the first chemicals used by Lister to prevent surgical infections was

Accepted Answer

A)  alcohol. 
B)  iodine. 
C)  carbolic acid. 
D)  mercury. 
A)  alcohol. 
B)  iodine. 
C)  carbolic acid. 
D)  mercury.

Question 17

Chlorine

Accepted Answer

A)  readily reacts with organics to produce potentially carcinogenic trihalomethanes. 
B)  is an effective, inexpensive, disinfectant able to destroy all types of microorganisms. 
C)  is unaffected by the presence of organic material. 
D)  is ineffective when diluted. 
E)  readily reacts with organics to produce potentially carcinogenic trihalomethanes AND is an effective, inexpensive, disinfectant able to destroy all types of microorganisms. 
A)  readily reacts with organics to produce potentially carcinogenic trihalomethanes. 
B)  is an effective, inexpensive, disinfectant able to destroy all types of microorganisms. 
C)  is unaffected by the presence of organic material. 
D)  is ineffective when diluted. 
E)  readily reacts with organics to produce potentially carcinogenic trihalomethanes AND is an effective, inexpensive, disinfectant able to destroy all types of microorganisms.

Question 18

Which of the following organisms are resistant to destruction by typical control methods?

Accepted Answer

A)  endospores of Bacillus and Clostridium 
B)  Pseudomonas 
C)  naked viruses 
D)  Mycobacterium spp. 
E)  All of the choices are correct. 
A)  endospores of Bacillus and Clostridium 
B)  Pseudomonas 
C)  naked viruses 
D)  Mycobacterium spp. 
E)  All of the choices are correct.

Question 19

Heat treatment is an effective method for sterilization or disinfection of all materials.

Accepted Answer

A) True 
 B)False

Question 20

Generally, heavy metals, except silver, have been proven to be too toxic for use on human tissue and are no longer used medically.

Accepted Answer

A) True 
 B)False

Exam 5: Control of Microbial Growth

Which is true of iodine?

Dry heat takes a much shorter time to sterilize material than wet heat.

Which of the following methods sterilize the materials?

Typical conditions used for sterilization are

A suffix used to describe a killing action would be

Hexachlorophene has been particularly effective against

Upon heat treatment, bacteria die at a constant proportion.

Boiling is very effective at removing most common waterborne pathogens.

Cold and freezing are very effective in killing bacteria.

If a process kills 90% of the organisms per minute, how many minutes would it take to kill all organisms when starting with 100,000 organisms?

Lister developed his ideas on prevention of infection during medical procedures after studying the work of

Gamma irradiation

Moist heat kills microorganisms by

Which of the following is true of hydrogen peroxide?

Commercial canning processes

One of the first chemicals used by Lister to prevent surgical infections was

Chlorine

Which of the following organisms are resistant to destruction by typical control methods?

Heat treatment is an effective method for sterilization or disinfection of all materials.

Generally, heavy metals, except silver, have been proven to be too toxic for use on human tissue and are no longer used medically.

Humans and the Microbial World

The Molecules of Life

Microscopy and Cell Structure

Dynamics of Prokaryotic Growth

Metabolism: Fueling Cell Growth

The Blueprint of Life, From Dna to Protein

Bacterial Genetics

Biotechnology and Recombinant Dna

Identification and Classification of Prokaryotes

The Diversity of Prokaryotic Organisms

The Eukaryotic Members of the Microbial World

Viruses, Viroids and Prions

The Innate Immune Response

The Adaptive Immune Response

Host-Microbe Interactions

Immunologic Disorders

Applications of Immune Responses

Epidemiology

Antimicrobial Medications

Respiratory System Infections

Skin Infections

Wound Infections

Digestive System Infections

Genitourinary Infections

Nervous System Infections

Blood and Lymphatic Infections

Hiv Disease and Complications of Immunodeficiency

Microbial Ecology

Environmental Microbiology: Treatment of Water, Wastes, and Polluted Habitats

Food Microbiology

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