Question 1

The most important function of nitrites in processed foods is to

Accepted Answer

A)  prevent browning. 
B)  inhibit the germination of Clostridium botulinum endospores. 
C)  prevent carcinogen formation. 
D)  make the food more acidic. 
E)  destroy cell membranes of potential pathogens. 
A)  prevent browning. 
B)  inhibit the germination of Clostridium botulinum endospores. 
C)  prevent carcinogen formation. 
D)  make the food more acidic. 
E)  destroy cell membranes of potential pathogens.

Question 2

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

Accepted Answer

A) True 
 B)False

Question 3

You go hiking with some friends in a nearby national park. The weather is cool when you set out but it quickly becomes very warm. Neither you nor your friends are carrying enough water. Eventually you find a stream and because you are so thirsty, you drink from it. About a week later you start to feel unwell. You have vomiting, abdominal cramps, and explosive diarrhea (loud, severe diarrhea). Your stool seems kind of oily and is difficult to flush away. You tell your RN brother about your signs and symptoms, and he tells you he thinks you may have giardiasis, caused by the protozoan Giardia lamblia.
-Your brother goes on to explain the concept of decimal reduction (D-value) time to you. To illustrate his point, he tells you that if the D-value for Giardia was 3 minutes and the starting number of cells was 10⁴, the time it would take to eliminate all of the Giardia cells would be

Accepted Answer

A)  15 minutes. 
B)  3 minutes. 
C)  10 minutes. 
D)  9 minutes. 
E)  12 minutes. 
A)  15 minutes. 
B)  3 minutes. 
C)  10 minutes. 
D)  9 minutes. 
E)  12 minutes.

Question 4

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)  Medium-temperature-intermediate-time pasteurization (MTIT) 
E)  Low-temperature-short-time pasteurization (LTST) 
A)  Pasteurization 
B)  High-temperature-short-time pasteurization (HTST) 
C)  Ultrahigh-temperature (UHT) method 
D)  Medium-temperature-intermediate-time pasteurization (MTIT) 
E)  Low-temperature-short-time pasteurization (LTST)

Question 5

Commercial canning processes

Accepted Answer

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

Question 6

Boiling is very effective at removing most common waterborne pathogens.

Accepted Answer

A) True 
 B)False

Question 7

The autoclave treatment may be monitored by

Accepted Answer

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

Question 8

Cold and freezing are very effective in killing bacteria.

Accepted Answer

A) True 
 B)False

Question 9

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

Accepted Answer

A) True 
 B)False

Question 10

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

The most important function of nitrites in processed foods is to

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

Which of the following methods sterilize the materials?

Commercial canning processes

Boiling is very effective at removing most common waterborne pathogens.

The autoclave treatment may be monitored by

Cold and freezing are very effective in killing bacteria.

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

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

Humans and the Microbial World

The Molecules of Life

Microscopy and Cell Structure

Dynamics of Microbial Growth

Microbial Metabolism: Fueling Cell Growth

The Blueprint of Life, from DNA to Protein

Bacterial Genetics

Biotechnology

Identifying and Classifying Microorganisms

The Diversity of Bacteria and Archaea

The Eukaryotic Members of the Microbial World

Viruses, Viroids, and Prions

The Innate Immune Response

The Adaptive Immune Response

Host-Microbe Interactions

Immunological Disorders

Applications of Immune Responses

Epidemiology

Antimicrobial Medications

Respiratory System Infections

Skin Infections

Wound Infections

Digestive System Infections

Blood and Lymphatic Infections

Nervous System Infections

Genitourinary Tract Infections

Microbial Ecology

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

Food Microbiology

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Exam 5: Control of Microbial Growth

The most important function of nitrites in processed foods is to

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

Which of the following methods sterilize the materials?

Commercial canning processes

Boiling is very effective at removing most common waterborne pathogens.

The autoclave treatment may be monitored by

Cold and freezing are very effective in killing bacteria.

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

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

Humans and the Microbial World

The Molecules of Life

Microscopy and Cell Structure

Dynamics of Microbial Growth

Microbial Metabolism: Fueling Cell Growth

The Blueprint of Life, from DNA to Protein

Bacterial Genetics

Biotechnology

Identifying and Classifying Microorganisms

The Diversity of Bacteria and Archaea

The Eukaryotic Members of the Microbial World

Viruses, Viroids, and Prions

The Innate Immune Response

The Adaptive Immune Response

Host-Microbe Interactions

Immunological Disorders

Applications of Immune Responses

Epidemiology

Antimicrobial Medications

Respiratory System Infections

Skin Infections

Wound Infections

Digestive System Infections

Blood and Lymphatic Infections

Nervous System Infections

Genitourinary Tract Infections

Microbial Ecology

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

Food Microbiology

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