Question 1

Phenolics

Accepted Answer

A)  denature proteins and destroy cytoplasmic membranes. 
B)  remain effective in the presence of detergents or organic material. 
C)  such as triclosan, have been used widely in various lotions and soaps. 
D)  reliably inactivate all groups of viruses. 
E)  denature proteins and destroy cytoplasmic membranes, remain effective in the presence of detergents or organic material, AND phenolics such as triclosan, have been used widely in various lotions and soaps. 
A)  denature proteins and destroy cytoplasmic membranes. 
B)  remain effective in the presence of detergents or organic material. 
C)  such as triclosan, have been used widely in various lotions and soaps. 
D)  reliably inactivate all groups of viruses. 
E)  denature proteins and destroy cytoplasmic membranes, remain effective in the presence of detergents or organic material, AND phenolics such as triclosan, have been used widely in various lotions and soaps.

Question 2

Hydrogen peroxide may be used as a sterilant on living tissue.

Accepted Answer

A) True 
 B)False

Question 3

Microbial death rates may be affected by

Accepted Answer

A)  pH. 
B)  temperature. 
C)  the presence of organics. 
D)  All of the choices are correct. 
A)  pH. 
B)  temperature. 
C)  the presence of organics. 
D)  All of the choices are correct.

Question 4

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 5

Plain soap is very effective in controlling spread of microorganisms because it is

Accepted Answer

A)  bacteriostatic. 
B)  very effective at the mechanical removal of microorganisms. 
C)  virucidal. 
D)  bactericidal. 
A)  bacteriostatic. 
B)  very effective at the mechanical removal of microorganisms. 
C)  virucidal. 
D)  bactericidal.

Question 6

Pasteurization results in the sterilization of food products.

Accepted Answer

A) True 
 B)False

Question 7

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 8

A common environmental organism that may even grow in certain chemical disinfectants is

Accepted Answer

A)  Escherichia coli. 
B)  Streptococcus pneumoniae. 
C)  Pseudomonas aeruginosa. 
D)  enveloped virus. 
A)  Escherichia coli. 
B)  Streptococcus pneumoniae. 
C)  Pseudomonas aeruginosa. 
D)  enveloped virus.

Question 9

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 of Geobacillus 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 of Geobacillus stearothermophilus.

Question 10

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

Accepted Answer

A) True 
 B)False

Question 11

Which would be most effective against Pseudomonas?

Accepted Answer

A)  alcohol 
B)  radiation 
C)  quaternary ammonium compounds 
D)  iodophors 
A)  alcohol 
B)  radiation 
C)  quaternary ammonium compounds 
D)  iodophors

Question 12

Chemical germicides

Accepted Answer

A)  may react irreversibly with proteins/enzymes. 
B)  may react with cytoplasmic membranes or viral envelopes. 
C)  may be disinfecting or even sterilizing. 
D)  are sensitive to dilution factor, time of contact, and temperature of use. 
E)  All of the choices are true. 
A)  may react irreversibly with proteins/enzymes. 
B)  may react with cytoplasmic membranes or viral envelopes. 
C)  may be disinfecting or even sterilizing. 
D)  are sensitive to dilution factor, time of contact, and temperature of use. 
E)  All of the choices are true.

Question 13

Ethylene oxide is gas that

Accepted Answer

A)  is very useful for sterilizing heat or moisture sensitive items. 
B)  is potentially carcinogenic. 
C)  is used as a 37% aqueous solution. 
D)  is effective against all microorganisms except endospores and viruses. 
E)  is very useful for sterilizing heat or moisture sensitive items AND is potentially carcinogenic. 
A)  is very useful for sterilizing heat or moisture sensitive items. 
B)  is potentially carcinogenic. 
C)  is used as a 37% aqueous solution. 
D)  is effective against all microorganisms except endospores and viruses. 
E)  is very useful for sterilizing heat or moisture sensitive items AND is potentially carcinogenic.

Question 14

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 15

Gamma rays cause biological damage in living systems by

Accepted Answer

A)  producing reactive molecules such as superoxide and hydroxyl free radicals. 
B)  causing tiny gravity sinks and black holes to be formed in the substance. 
C)  introducing toxins. 
D)  making the substance radioactive. 
A)  producing reactive molecules such as superoxide and hydroxyl free radicals. 
B)  causing tiny gravity sinks and black holes to be formed in the substance. 
C)  introducing toxins. 
D)  making the substance radioactive.

Question 16

Nosocomial infections

Accepted Answer

A)  are acquired at various social events. 
B)  are acquired while in the hospital. 
C)  occur because of a susceptible population and presence of disease causing organisms. 
D)  are acquired at sporting events. 
E)  are acquired while in the hospital AND occur because of a susceptible population and presence of disease causing organisms. 
A)  are acquired at various social events. 
B)  are acquired while in the hospital. 
C)  occur because of a susceptible population and presence of disease causing organisms. 
D)  are acquired at sporting events. 
E)  are acquired while in the hospital AND occur because of a susceptible population and presence of disease causing organisms.

Question 17

Quaternary ammonium compounds are

Accepted Answer

A)  cationic detergents which help wash surfaces. 
B)  attracted to the negative charge on the microbial cell surface. 
C)  used as a 37% aqueous solution. 
D)  very effective against Pseudomonas. 
E)  cationic detergents which help wash surfaces AND attracted to the negative charge on the microbial cell surface. 
A)  cationic detergents which help wash surfaces. 
B)  attracted to the negative charge on the microbial cell surface. 
C)  used as a 37% aqueous solution. 
D)  very effective against Pseudomonas. 
E)  cationic detergents which help wash surfaces AND attracted to the negative charge on the microbial cell surface.

Question 18

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 19

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 which uses intense cold to kill microorganisms on foods. 
D)  is a process which 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 which uses intense cold to kill microorganisms on foods. 
D)  is a process which uses short bursts of radiation to kill microorganisms on foods.

Question 20

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.

Exam 5: Control of Microbial Growth

Phenolics

Hydrogen peroxide may be used as a sterilant on living tissue.

Microbial death rates may be affected by

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

Plain soap is very effective in controlling spread of microorganisms because it is

Pasteurization results in the sterilization of food products.

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

A common environmental organism that may even grow in certain chemical disinfectants is

The autoclave treatment may be monitored by

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

Which would be most effective against Pseudomonas?

Chemical germicides

Ethylene oxide is gas that

Which of the following is not a sterilization method?

Gamma rays cause biological damage in living systems by

Nosocomial infections

Quaternary ammonium compounds are

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

Pasteurization

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

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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