Question 1

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

Accepted Answer

A) Endospores of Bacillus and Clostridium 
B) Pseudomonas 
C) Non-enveloped viruses 
D) Mycobacterium spp. 
E) All of the choices are correct. 
A) Endospores of Bacillus and Clostridium 
B) Pseudomonas 
C) Non-enveloped viruses 
D) Mycobacterium spp. 
E) All of the choices are correct. E

Question 2

The more bacteria one starts with,the longer it will take to kill them all.

Accepted Answer

A) True 
 B)False  True

Question 3

Chlorhexidine

Accepted Answer

A) is a member of the biguanides. 
B) is extensively used in antiseptics. 
C) is ineffective against vegetative bacteria. 
D) is limited in use due to its high toxicity. 
E) is a member of the biguanides AND is extensively used in antiseptics. 
A) is a member of the biguanides. 
B) is extensively used in antiseptics. 
C) is ineffective against vegetative bacteria. 
D) is limited in use due to its high toxicity. 
E) is a member of the biguanides AND is extensively used in antiseptics. E

Question 4

Compounds of tin,mercury,arsenic,and copper are no longer used to prevent microbial growth in cooling water primarily because

Accepted Answer

A) antibiotics are cheaper. 
B) other chemicals were shown to be much more effective. 
C) microbes developed resistance to these metals. 
D) their use contributes to serious pollution of natural waters. 
E) All of the choices are correct. 
A) antibiotics are cheaper. 
B) other chemicals were shown to be much more effective. 
C) microbes developed resistance to these metals. 
D) their use contributes to serious pollution of natural waters. 
E) All of the choices are correct.

Question 5

To reduce or eliminate disease-/spoilage-causing organisms,food is often subjected to

Accepted Answer

A) heat. 
B) chemical additives. 
C) radiation. 
D) cold. 
E) All of the choices are correct. 
A) heat. 
B) chemical additives. 
C) radiation. 
D) cold. 
E) All of the choices are correct.

Question 6

Pasteurization results in the sterilization of food products.

Accepted Answer

A) True 
 B)False

Question 7

In order to speed up the sterilization process,which of the following would be useful?

Accepted Answer

A) Drying the material 
B) Washing/mechanical removal of bacteria/organic matter 
C) Addition of organics 
D) Nothing 
E) Washing/mechanical removal of bacteria/organic matter AND addition of organics 
A) Drying the material 
B) Washing/mechanical removal of bacteria/organic matter 
C) Addition of organics 
D) Nothing 
E) Washing/mechanical removal of bacteria/organic matter AND addition of organics

Question 8

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 9

Which of the following is not a sterilization method?

Accepted Answer

A) Hot air oven 
B) Autoclave 
C) Pasteurization 
D) Filtration 
A) Hot air oven 
B) Autoclave 
C) Pasteurization 
D) Filtration

Question 10

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 11

Upon treatment with heat or chemicals,bacteria will

Accepted Answer

A) all die immediately. 
B) die at a constant proportion. 
C) die at an exponential rate. 
D) die at a geometric rate. 
A) all die immediately. 
B) die at a constant proportion. 
C) die at an exponential rate. 
D) die at a geometric rate.

Question 12

The autoclave treatment may be monitored by

Accepted Answer

A) heat-sensitive tape. 
B) heat-resistant endospores of Geobacillus stearothermophilus. 
C) pressure indicators alone. 
D) waiting for contaminants to appear on freshly poured media. 
E) heat-sensitive tape AND heat-resistant endospores ofGeobacillus stearothermophilus. 
A) heat-sensitive tape. 
B) heat-resistant endospores of Geobacillus stearothermophilus. 
C) pressure indicators alone. 
D) waiting for contaminants to appear on freshly poured media. 
E) heat-sensitive tape AND heat-resistant endospores ofGeobacillus stearothermophilus.

Question 13

A common application of dry heat in the microbiology laboratory is to

Accepted Answer

A) prepare specimens for study. 
B) sterilize media. 
C) sterilize plastics. 
D) sterilize the inoculating loop. 
A) prepare specimens for study. 
B) sterilize media. 
C) sterilize plastics. 
D) sterilize the inoculating loop.

Question 14

Silver sulfadiazine,a combination of silver and a sulfa drug,is used to

Accepted Answer

A) disinfect water for drinking. 
B) prevent infection of surgical wounds. 
C) prevent infection of second- and third-degree burns. 
D) counteract lead poisoning. 
E) treat bites from werewolves. 
A) disinfect water for drinking. 
B) prevent infection of surgical wounds. 
C) prevent infection of second- and third-degree burns. 
D) counteract lead poisoning. 
E) treat bites from werewolves.

Question 15

Upon heat treatment,bacteria die at a constant proportion.

Accepted Answer

A) True 
 B)False

Question 16

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

Accepted Answer

A) True 
 B)False

Question 17

Generally,membrane filters are not used to remove

Accepted Answer

A) bacteria from liquids. 
B) microorganisms from gases. 
C) spoilage agents from alcoholic beverages. 
D) enzymes. 
A) bacteria from liquids. 
B) microorganisms from gases. 
C) spoilage agents from alcoholic beverages. 
D) enzymes.

Question 18

Pasteurization

Accepted Answer

A) is the use of heat to sterilize food products. 
B) is the use of heat to reduce numbers of pathogenic/spoilage bacteria in a food item to a safe level. 
C) is a process that uses intense cold to kill microorganisms on foods. 
D) is a process that uses short bursts of radiation to kill microorganisms on foods. 
A) is the use of heat to sterilize food products. 
B) is the use of heat to reduce numbers of pathogenic/spoilage bacteria in a food item to a safe level. 
C) is a process that uses intense cold to kill microorganisms on foods. 
D) is a process that uses short bursts of radiation to kill microorganisms on foods.

Question 19

100% ethanol is twice as effective as 60% ethanol at controlling bacteria.

Accepted Answer

A) True 
 B)False

Question 20

Microwaves do not kill organisms directly but kill by

Accepted Answer

A) the heat they generate in a product. 
B) generating free radicals. 
C) generating toxins. 
D) creating thymine dimers. 
A) the heat they generate in a product. 
B) generating free radicals. 
C) generating toxins. 
D) creating thymine dimers.

Exam 5: Control of Microbial Growth

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

The more bacteria one starts with,the longer it will take to kill them all.

Chlorhexidine

Compounds of tin,mercury,arsenic,and copper are no longer used to prevent microbial growth in cooling water primarily because

To reduce or eliminate disease-/spoilage-causing organisms,food is often subjected to

Pasteurization results in the sterilization of food products.

In order to speed up the sterilization process,which of the following would be useful?

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

Which of the following is not a sterilization method?

Commercial canning processes

Upon treatment with heat or chemicals,bacteria will

The autoclave treatment may be monitored by

A common application of dry heat in the microbiology laboratory is to

Silver sulfadiazine,a combination of silver and a sulfa drug,is used to

Upon heat treatment,bacteria die at a constant proportion.

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

Generally,membrane filters are not used to remove

Pasteurization

100% ethanol is twice as effective as 60% ethanol at controlling bacteria.

Microwaves do not kill organisms directly but kill by

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 Prokaryotic Organisms

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 Tract Infections

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