Question 1

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. E

Question 2

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 3

Organic acids, such as benzoic acid, are often added to foods to prevent microbial growth.

Accepted Answer

A) True 
 B)False  True

Question 4

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 5

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 6

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

Accepted Answer

A) True 
 B)False

Question 7

Liquid media containing heat-sensitive components would best be sterilized by

Accepted Answer

A) Ultraviolet (UV) light at 500 nm. 
B) freezing. 
C) lyophilization. 
D) membrane filtration. 
A) Ultraviolet (UV) light at 500 nm. 
B) freezing. 
C) lyophilization. 
D) membrane filtration.

Question 8

Boiling is very effective at removing most common waterborne pathogens.

Accepted Answer

A) True 
 B)False

Question 9

Which of the following is(are) considered when selecting a germicidal chemical?

Accepted Answer

A) toxicity 
B) cost 
C) compatibility with the material being treated 
D) environmental impact 
E) All of the choices are correct. 
A) toxicity 
B) cost 
C) compatibility with the material being treated 
D) environmental impact 
E) All of the choices are correct.

Question 10

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

Question 11

Alcohols are not reliably effective at destroying

Accepted Answer

A) vegetative bacteria. 
B) enveloped viruses. 
C) naked viruses. 
D) endospores. 
E) naked viruses AND endospores. 
A) vegetative bacteria. 
B) enveloped viruses. 
C) naked viruses. 
D) endospores. 
E) naked viruses AND endospores.

Question 12

Pasteurization results in the sterilization of food products.

Accepted Answer

A) True 
 B)False

Question 13

Ultraviolet radiation at the bactericidal wavelength destroy bacteria by

Accepted Answer

A) destroying endospores. 
B) damaging nucleic acid. 
C) preventing spore formation. 
D) denaturing proteins. 
A) destroying endospores. 
B) damaging nucleic acid. 
C) preventing spore formation. 
D) denaturing proteins.

Question 14

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 15

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 16

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 17

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 18

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 19

In a one D process, how many D values would it take to reduce a population of 1010 cells to one survivor?

Accepted Answer

A) 2 
B) 4 
C) 5 
D) 10 
A) 2 
B) 4 
C) 5 
D) 10

Question 20

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.

Exam 5: Control of Microbial Growth

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

Chlorhexidine

Organic acids, such as benzoic acid, are often added to foods to prevent microbial growth.

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

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

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

Liquid media containing heat-sensitive components would best be sterilized by

Boiling is very effective at removing most common waterborne pathogens.

Which of the following is(are) considered when selecting a germicidal chemical?

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

Alcohols are not reliably effective at destroying

Pasteurization results in the sterilization of food products.

Ultraviolet radiation at the bactericidal wavelength destroy bacteria by

Ethylene oxide is gas that

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

Microbial death rates may be affected by

Which would be most effective against Pseudomonas?

Which of the following methods sterilize the materials?

In a one D process, how many D values would it take to reduce a population of 1010 cells to one survivor?

Which is true of iodine?

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

Filters

In a one D process, how many D values would it take to reduce a population of 10¹⁰ cells to one survivor?