Question 1

The chemical agent/s that produce/s highly reactive hydroxyl-free radicals and also decomposes to O2 gas is

Accepted Answer

A) Cidex. 
B) cationic detergents. 
C) hydrogen peroxide. 
D) chlorhexidine. 
E) iodophors. 
A) Cidex. 
B) cationic detergents. 
C) hydrogen peroxide. 
D) chlorhexidine. 
E) iodophors.

Question 2

In lab,inoculating loops are sterilized using

Accepted Answer

A) moist heat. 
B) chemicals. 
C) incineration. 
D) filtration. 
E) gas sterilization. 
A) moist heat. 
B) chemicals. 
C) incineration. 
D) filtration. 
E) gas sterilization.

Question 3

Filtration sterilization

Accepted Answer

A) can remove viruses. 
B) relies on gravity. 
C) removes toxins. 
D) uses heat and filtration. 
E) leaves behind endospores. 
A) can remove viruses. 
B) relies on gravity. 
C) removes toxins. 
D) uses heat and filtration. 
E) leaves behind endospores.

Question 4

Your aim is to sterilize prosthetic devices like heart valves and artificial joint structures before being used in the patient.Considering where they will be placed and the probable composition of the devices,what would be the best chemical to use?

Accepted Answer

A) iodine 
B) crystal violet dye 
C) quaternary ammonium compounds 
D) bleach 
A) iodine 
B) crystal violet dye 
C) quaternary ammonium compounds 
D) bleach

Question 5

Intermittent sterilization,which uses 3 days of lower temperature steam for short periods of time,is also called

Accepted Answer

A) pasteurization. 
B) incubation. 
C) tyndallization. 
D) disinfection. 
E) desiccation. 
A) pasteurization. 
B) incubation. 
C) tyndallization. 
D) disinfection. 
E) desiccation.

Question 6

Place the following forms of radiation in order from the most penetrating to the least penetrating.

Accepted Answer

A) gamma,cathode,X rays 
B) gamma,X rays,cathode 
C) cathode,gamma,X ray 
D) cathode,X ray,gamma 
E) X ray,gamma,cathode 
A) gamma,cathode,X rays 
B) gamma,X rays,cathode 
C) cathode,gamma,X ray 
D) cathode,X ray,gamma 
E) X ray,gamma,cathode

Question 7

Your little girl is in the ICU ward of a hospital,and you would like to take her favorite little cloth doll to her.However,it must be sterilized.Your choices of sterilization are ethylene oxide gas,ultraviolet radiation,or an iodophor containing solution.Which of the following is an accurate evaluation of these choices?

Accepted Answer

A) Betadine is not feasible as a choice since most iodophore solutions do not sterilize. 
B) Ethylene oxide gas is a great sterilant,and there is no toxicity associated with it. 
C) Ultraviolet radiation is a good choice for complete sterilization because it is cheap. 
D) All of these choices are equally good as sterilizing agents and will not harm the doll. 
A) Betadine is not feasible as a choice since most iodophore solutions do not sterilize. 
B) Ethylene oxide gas is a great sterilant,and there is no toxicity associated with it. 
C) Ultraviolet radiation is a good choice for complete sterilization because it is cheap. 
D) All of these choices are equally good as sterilizing agents and will not harm the doll.

Question 8

All of the following are phenols or phenolics except

Accepted Answer

A) Lysol. 
B) hexachlorophene. 
C) triclosan. 
D) cresols. 
E) chlorhexidine. 
A) Lysol. 
B) hexachlorophene. 
C) triclosan. 
D) cresols. 
E) chlorhexidine.

Question 9

Which antimicrobial method does not sterilize?

Accepted Answer

A) autoclave 
B) ethylene oxide gas 
C) pasteurization 
D) ionizing radiation 
A) autoclave 
B) ethylene oxide gas 
C) pasteurization 
D) ionizing radiation

Question 10

Which control method would not be a suitable choice for killing Mycobacterium in a capped culture tube?

Accepted Answer

A) ultraviolet (germicidal)light 
B) gamma rays 
C) 121$\circ$C at 15 psi for 15 minutes 
D) 160$\circ$C for 2 hours 
E) All of the choices are correct. 
A) ultraviolet (germicidal)light 
B) gamma rays 
C) 121$\circ$C at 15 psi for 15 minutes 
D) 160$\circ$C for 2 hours 
E) All of the choices are correct.

Question 11

Alcohols

Accepted Answer

A) denature proteins when in a 50-95% alcohol-water solution. 
B) disinfect items when soaking method is utilized. 
C) are skin degerming agents. 
D) at 50% or higher concentrations dissolve cell membrane lipids. 
E) All of the choices are correct. 
A) denature proteins when in a 50-95% alcohol-water solution. 
B) disinfect items when soaking method is utilized. 
C) are skin degerming agents. 
D) at 50% or higher concentrations dissolve cell membrane lipids. 
E) All of the choices are correct.

Question 12

The presence of organic matter such as saliva and pus can interfere with the actions of disinfectants.

Accepted Answer

A) True 
 B)False

Question 13

Which of the following factors will influence the action of microbial agents?

Accepted Answer

A) the number of microorganisms 
B) the type of microorganisms present 
C) temperature and pH 
D) mode and dosage of the agent 
E) All of the choices will influence the action. 
A) the number of microorganisms 
B) the type of microorganisms present 
C) temperature and pH 
D) mode and dosage of the agent 
E) All of the choices will influence the action.

Question 14

All of the following are alkylating control agents except

Accepted Answer

A) ethylene oxide. 
B) iodophor. 
C) glutaraldehyde. 
D) formaldehyde. 
E) propylene oxide. 
A) ethylene oxide. 
B) iodophor. 
C) glutaraldehyde. 
D) formaldehyde. 
E) propylene oxide.

Question 15

Endospores can be inactivated by

Accepted Answer

A) dry heat at 170$\circ$ C for 2 hours. 
B) incineration. 
C) glutaraldehyde for 3 or more hours. 
D) ethylene oxide for 3 or more hours. 
E) All of the choices are correct. 
A) dry heat at 170$\circ$ C for 2 hours. 
B) incineration. 
C) glutaraldehyde for 3 or more hours. 
D) ethylene oxide for 3 or more hours. 
E) All of the choices are correct.

Question 16

The use of a physical or chemical process to destroy vegetative pathogens on inanimate objects is

Accepted Answer

A) disinfection. 
B) sterilization. 
C) antisepsis. 
D) sanitization. 
E) degermation. 
A) disinfection. 
B) sterilization. 
C) antisepsis. 
D) sanitization. 
E) degermation.

Question 17

Isopropyl alcohol wiped across a skin site can sterilize it.

Accepted Answer

A) True 
 B)False

Question 18

_____ radiation excites atoms to a higher energy state within molecules such as DNA that then leads to the formation of pyrimidine dimers.

Accepted Answer

A) Infrared 
B) Ultraviolet 
C) Gamma 
D) Particle 
E) Ionizing 
A) Infrared 
B) Ultraviolet 
C) Gamma 
D) Particle 
E) Ionizing

Question 19

Placing organisms at 4oC is

Accepted Answer

A) bactericidal. 
B) bacteriostatic. 
C) decontamination. 
D) sterilization. 
E) germicidal. 
A) bactericidal. 
B) bacteriostatic. 
C) decontamination. 
D) sterilization. 
E) germicidal.

Question 20

Which of the following is not true of glutaraldehyde?

Accepted Answer

A) is classified as a carcinogen 
B) inactivates viruses 
C) does not damage plastics 
D) cross-links proteins on cell surfaces 
E) inactivates endospores in 3 hours 
A) is classified as a carcinogen 
B) inactivates viruses 
C) does not damage plastics 
D) cross-links proteins on cell surfaces 
E) inactivates endospores in 3 hours

Exam 11: Physical and Chemical Control of Microbes

The chemical agent/s that produce/s highly reactive hydroxyl-free radicals and also decomposes to O2 gas is

In lab,inoculating loops are sterilized using

Filtration sterilization

Your aim is to sterilize prosthetic devices like heart valves and artificial joint structures before being used in the patient.Considering where they will be placed and the probable composition of the devices,what would be the best chemical to use?

Intermittent sterilization,which uses 3 days of lower temperature steam for short periods of time,is also called

Place the following forms of radiation in order from the most penetrating to the least penetrating.

All of the following are phenols or phenolics except

Which antimicrobial method does not sterilize?

Which control method would not be a suitable choice for killing Mycobacterium in a capped culture tube?

Alcohols

The presence of organic matter such as saliva and pus can interfere with the actions of disinfectants.

Which of the following factors will influence the action of microbial agents?

All of the following are alkylating control agents except

Endospores can be inactivated by

The use of a physical or chemical process to destroy vegetative pathogens on inanimate objects is

Isopropyl alcohol wiped across a skin site can sterilize it.

_____ radiation excites atoms to a higher energy state within molecules such as DNA that then leads to the formation of pyrimidine dimers.

Placing organisms at 4oC is

Which of the following is not true of glutaraldehyde?

The Main Themes of Microbiology

The Chemistry of Biology

Tools of the Laboratory: Methods for the Culturing of Microscopic Analysis of Microorganisms

Prokaryotic Profiles: The Bacteria and Archaea

Eukaryotic Cells and Microorganisms

An Introduction to the Viruses

Microbial Nutrition, Ecology, and Growth

Microbial Metabolism: the Chemical Crossroads of Life

Microbial Genetics

Genetic Engineering and Recombinant Dna

Drugs, Microbes, host-The Elements of Chemotherapy

Microbe-Human Interactions: Infection and Disease

Host Defenses I: Overview and Nonspecific Defenses

Host Defenses II: Specific Immunity and Immunization

Disorders in Immunity

Diagnosing Infections

Infectious Diseases Affecting the Skin and Eyes

Infectious Diseases Affecting the Nervous System

Infectious Diseases Affecting the Cardiovascular and Lymphatic Systems

Infectious Diseases Affecting the Respiratory System

Infectious Diseases Affecting the Gastrointestinal Tract

Infectious Diseases Affecting the Genitourinary System

Microbes and the Environment

Applied Microbiology and Food and Water Safety

Filters

The chemical agent/s that produce/s highly reactive hydroxyl-free radicals and also decomposes to O₂ gas is

Placing organisms at 4^oC is