Question 1

Discuss the purpose and level of control achieved by pasteurization.Compare the flash and batch methods.

Accepted Answer

Pasteurization is a process used to kill

Question 2

Explain why boiling water is considered disinfection, not a sterilization method.List three materials commonly disinfected by boiling water.

Accepted Answer

Boiling water is considered a disinfecti

Question 3

Which of the following is officially accepted as a sterilant and high-level disinfectant?

Accepted Answer

A) benzalkonium chloride 
B) silver nitrate 
C) glutaraldehyde 
D) triclosan 
E) cresol 
A) benzalkonium chloride 
B) silver nitrate 
C) glutaraldehyde 
D) triclosan 
E) cresol

Question 4

Which is mismatched?

Accepted Answer

A) Sodium hypochlorite - chlorine 
B) Iodophor - iodine 
C) Benzalkonium chloride - quaternary ammonium compound 
D) Merthiolate - silver 
E) Formalin - formaldehyde 
A) Sodium hypochlorite - chlorine 
B) Iodophor - iodine 
C) Benzalkonium chloride - quaternary ammonium compound 
D) Merthiolate - silver 
E) Formalin - formaldehyde

Question 5

All of the following are correct about the autoclave, except:

Accepted Answer

A) it is important not to overload the chamber. 
B) it is effective for sterilizing powders, oils, and waxy substances. 
C) the duration of the process depends on how full the chamber is. 
D) it is the temperature that kills the microbes, not the pressure by itself. 
E) sterilization is achieved when steam condenses against the objects in the chamber and raises their temperatures. 
A) it is important not to overload the chamber. 
B) it is effective for sterilizing powders, oils, and waxy substances. 
C) the duration of the process depends on how full the chamber is. 
D) it is the temperature that kills the microbes, not the pressure by itself. 
E) sterilization is achieved when steam condenses against the objects in the chamber and raises their temperatures.

Question 6

Which of the following chemicals is a disinfectant for soft contact lenses?

Accepted Answer

A) hydrogen peroxide 
B) alcohol 
C) hexachlorophene 
D) glutaraldehyde 
E) hypochorites 
A) hydrogen peroxide 
B) alcohol 
C) hexachlorophene 
D) glutaraldehyde 
E) hypochorites

Question 7

The chemical agent that produces 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 8

Aniline dyes like crystal violet have antimicrobial activity particularly against gram positive bacteria and some fungi.

Accepted Answer

A) True 
 B)False

Question 9

All of the following are correct about iodophors, except:

Accepted Answer

A) they are complexes of iodine and a neutral polymer. 
B) this formulation allows a quick release of free iodine. 
C) this formulation increases its penetration. 
D) it is less prone to staining or irritating tissue. 
E) a common iodophor is Betadine. 
A) they are complexes of iodine and a neutral polymer. 
B) this formulation allows a quick release of free iodine. 
C) this formulation increases its penetration. 
D) it is less prone to staining or irritating tissue. 
E) a common iodophor is Betadine.

Question 10

Scrubbing or immersing the skin in chemicals to reduce the numbers of microbes on the skin is:

Accepted Answer

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

Question 11

Which is correct regarding the rate of microbial death?

Accepted Answer

A) cells die at increasingly greater rates 
B) only older cells die in a culture 
C) cells in a culture die at a constant rate 
D) upon contact with the control agent, all cells die at one time 
E) cells become metabolically inactive but are never killed 
A) cells die at increasingly greater rates 
B) only older cells die in a culture 
C) cells in a culture die at a constant rate 
D) upon contact with the control agent, all cells die at one time 
E) cells become metabolically inactive but are never killed

Question 12

Commercial products containing which types of chemicals are more effective at killing microorganisms?

Accepted Answer

A) bacteriostatic 
B) bacteriocidal 
C) carbohydrate 
D) lead 
E) None of these are correct. 
A) bacteriostatic 
B) bacteriocidal 
C) carbohydrate 
D) lead 
E) None of these are correct.

Question 13

Vials of microorganisms that undergo the freeze-drying process called _____ will remain preserved and viable for years.

Accepted Answer

The answer of Vials of microorganisms that undergo the freeze-drying...

Question 14

The minimum sterilizing conditions in a steam autoclave are:

Accepted Answer

A) 121$\circ$C at 15 psi for 15 minutes. 
B) 63$\circ$ C for 30 minutes. 
C) 160$\circ$C for 2 hours. 
D) 71.6$\circ$ C for 15 seconds. 
E) 100$\circ$ C for 30 minutes. 
A) 121$\circ$C at 15 psi for 15 minutes. 
B) 63$\circ$ C for 30 minutes. 
C) 160$\circ$C for 2 hours. 
D) 71.6$\circ$ C for 15 seconds. 
E) 100$\circ$ C for 30 minutes.

Question 15

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

Accepted Answer

A) True 
 B)False

Question 16

Ethylene oxide is:

Accepted Answer

A) sporicidal. 
B) only effective with high heat. 
C) the active agent in household bleach. 
D) used as an antiseptic against anaerobes. 
E) a halogen. 
A) sporicidal. 
B) only effective with high heat. 
C) the active agent in household bleach. 
D) used as an antiseptic against anaerobes. 
E) a halogen.

Question 17

All the following are correct about detergents, except:

Accepted Answer

A) they are polar molecules that act as surfactants. 
B) the most effective ones are positively charged. 
C) in low concentrations they are bacteriostatic. 
D) they are ineffective against the tuberculosis bacteria. 
E) they are active in the presence of organic matter. 
A) they are polar molecules that act as surfactants. 
B) the most effective ones are positively charged. 
C) in low concentrations they are bacteriostatic. 
D) they are ineffective against the tuberculosis bacteria. 
E) they are active in the presence of organic matter.

Question 18

All of the following pertain to hypochlorites, except:

Accepted Answer

A) release hypochlorous acid in solution. 
B) cause denaturation of enzymes. 
C) found in iodophors. 
D) used to disinfect dairy, restaurant, and medical equipment. 
E) found in common household bleach. 
A) release hypochlorous acid in solution. 
B) cause denaturation of enzymes. 
C) found in iodophors. 
D) used to disinfect dairy, restaurant, and medical equipment. 
E) found in common household bleach.

Question 19

Which common hospital pathogen is able to grow abundantly in soap dishes?

Accepted Answer

A) Escherichia coli 
B) Pseudomonas 
C) Hemophilus influenzae 
D) Mycobacteria tuberculosis 
E) Salmonella 
A) Escherichia coli 
B) Pseudomonas 
C) Hemophilus influenzae 
D) Mycobacteria tuberculosis 
E) Salmonella

Question 20

Some microbial control agents are able to _____ cell proteins by breaking bonds that maintain the native state, three-dimensional configuration of the proteins.

Accepted Answer

The answer of Some microbial control agents are able to...

Exam 11: Physical and Chemical Agents for Microbial Control

Discuss the purpose and level of control achieved by pasteurization.Compare the flash and batch methods.

Explain why boiling water is considered disinfection, not a sterilization method.List three materials commonly disinfected by boiling water.

Which of the following is officially accepted as a sterilant and high-level disinfectant?

Which is mismatched?

All of the following are correct about the autoclave, except:

Which of the following chemicals is a disinfectant for soft contact lenses?

The chemical agent that produces highly reactive hydroxyl-free radicals and also decomposes to O2 gas is:

Aniline dyes like crystal violet have antimicrobial activity particularly against gram positive bacteria and some fungi.

All of the following are correct about iodophors, except:

Scrubbing or immersing the skin in chemicals to reduce the numbers of microbes on the skin is:

Which is correct regarding the rate of microbial death?

Commercial products containing which types of chemicals are more effective at killing microorganisms?

Vials of microorganisms that undergo the freeze-drying process called _____ will remain preserved and viable for years.

The minimum sterilizing conditions in a steam autoclave are:

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

Ethylene oxide is:

All the following are correct about detergents, except:

All of the following pertain to hypochlorites, except:

Which common hospital pathogen is able to grow abundantly in soap dishes?

Some microbial control agents are able to _____ cell proteins by breaking bonds that maintain the native state, three-dimensional configuration of the proteins.

The Main Themes of Microbiology

The Chemistry of Biology

Tools of the Laboratory: Methods of Studying Microorganisms

A Survey of Prokaryotic Cells and Microorganisms

A Survey of Eukaryotic Cells and Microorganisms

An Introduction to Viruses

Microbial Nutrition, Ecology, and Growth

An Introduction to Microbial Metabolism: the Chemical Crossroads of Life

An Introduction to Microbial Genetics

Genetic Engineering: a Revolution in Molecular Biology

Drugs, Microbes, Host-The Elements of Chemotherapy

Microbe-Human Interactions: Infection, Disease, and Epidemiology

An Introduction to Host Defenses and Innate Immunities

Adaptive, Specific Immunity and Immunization

Disorders in Immunity

Procedures for Identifying Pathogens and Diagnosing Infections

The Gram-Positive and Gram-Negative Cocci of Medical Importance

The Gram-Positive Bacilli of Medical Importance

The Gram-Negative Bacilli of Medical Importance

Miscellaneous Bacterial Agents of Disease

The Fungi of Medical Importance

The Parasites of Medical Importance

Introduction to Viruses That Infect Humans: the Dna Viruses

The Rna Viruses That Infect Humans

Environmental Microbiology

Applied and Industrial Microbiology

Filters

The chemical agent that produces highly reactive hydroxyl-free radicals and also decomposes to O₂ gas is: