Bio-205 Module 6 Quiz B

The term "sterilization" applies to the removal of all of the following EXCEPT:

bacterial endospores.

prions.

fungi.

viruses.

bacterial cells.

Which of the following is an example of degerming?

cleaning a public toilet

using heat to make milk safe to drink

scrubbing your hands

preparing your lab benchtop for work

canning fruits or vegetables

Which of the following is an example of sanitization?

A nurse prepares an injection site with an alcohol swab.

A public toilet is treated with disinfectants.

An autoclave is used to prepare nutrient agar.

A surgeon washes her hands before surgery.

Heat is used to kill potential pathogens in apple juice.

Aseptic means

free of all pathogens.

sanitized.

sterile.

free of all microbes.

clean.

Which of the following would NOT be bacteriostatic?

freezing below 0°C

lyophilization

autoclaving

refrigeration of mesophiles

desiccation

Antimicrobial agents that interfere with nucleic acids also stop protein synthesis because

A) the ribosome contains ribozymes.

B) nucleic acids are involved in the production of proteins.

C) proteins are involved in the production of nucleic acids.

D) Both A and B are correct.

E) A, B, and C are correct.

Which of the following is the least resistant to antimicrobial agents?

protozoan cysts

bacterial endospores

enveloped viruses

protozoa

Gram-positive bacteria

An instrument that will be used in an invasive medical procedure should be disinfected with a(n)

low-level germicide.

high-level germicide.

intermediate-level germicide.

Both A and C are correct.

A, B, and C are correct.

All of the following sterilize EXCEPT:

lyophilization.

autoclaving.

dry heat.

ionizing radiation.

incineration.

Which of the following describes the batch method of pasteurization?

heating at 134°C for one second

heating at 72°C for 15 minutes

passing liquid through steam at 140°C

heating at 72°C for 15 seconds

heating at 63°C for 30 minutes

The dairy creamer used in restaurants is usually sterilized by

ionizing radiation.

filtration.

UHT sterilization.

lyophilization.

autoclaving.

All of the following are components of an autoclave EXCEPT:

valves.

temperature gauges.

a pressure chamber.

pressure gauges.

membrane filters.

Which of the following is a target of pasteurization?

Neisseria gonorrhoeae

Bacillus stearothermophilus

Clostridium botulinum

Brucella melitensis

Chlamydia trachomatis

All of the following statements concerning radiation as a method of microbial control are true EXCEPT:

UV light effectively kills cells but does not penetrate surfaces well.

X rays are the most practical form of ionizing radiation for microbial control.

microwaves are valuable in microbial control only when they are used to heat food.

gamma rays penetrate substances well but require hours to kill microbes.

electron beams have a lot of energy but do not penetrate substances very well.

Which of the following is used for microbial control in fresh fruits and vegetables?

gamma rays

X rays

electron beams

ultraviolet light

microwaves

Which of the following can be used to disinfect air?

ultraviolet light

ethylene oxide

HEPA filters

Both A and C are correct.

Both A and B are correct.

Which of the following has been incorporated into consumer products such as diapers and cutting boards?

ethylene oxide

peracetic acid

hexachlorophene

triclosan

thimerosal

Concerning alcohol, which of the following statements is false?

Dissolving another chemical in alcohol is a good way to make it more effective.

One hundred percent alcohol is the most effective form.

Alcohols are intermediate-level disinfectants.

Isopropanol is a better disinfectant than ethanol.

Alcohols have more than one cellular target.

Betadine is an example of which of the following?

phenolics

halogens

alcohols

surfactants

heavy metals

All of the following are characteristics of quaternary ammonium compounds EXCEPT:

Zephiran is an example of a quat.

they are a type of detergent.

they function by cross-linking proteins.

they are used by Pseudomonas aeruginosa as a nutrient.

they are harmless to humans except at high concentrations.

Which of the following was used in the past to prevent the transmission of gonorrhea from an infected mother to her newborn?

silver nitrate

thimerosal

hydrogen peroxide

hexachlorophene

beta-propiolactone

Which of the following is used to sterilize items that should not, or cannot, be exposed to heat or water?

triclosan

ethylene oxide

calcium hypochlorite

formaldehyde

hydrogen peroxide

All of the following are characteristics of aldehydes EXCEPT:

some can sterilize after long periods of time.

they are used only to preserve dead tissues.

they are used in aqueous solutions.

they denature proteins.

they are usually hazardous to humans.

All of the following are characteristics of iodophors EXCEPT:

they are halogens.

they have long-lasting effects.

they are used as an antiseptic.

they are inorganic molecules.

betadine is an example.

A chemical agent that kills pathogenic microbes in general is a(n)

fungicide.

antiseptic.

disinfectant.

germicide.

sanitizer.

All of the following are characteristics of an ideal antimicrobial agent EXCEPT:

it is inexpensive.

it is harmless to humans.

it is stable during storage.

it denatures proteins.

it acts quickly.

Boiling water rapidly kills all of the following EXCEPT:

protozoan trophozoites.

fungal cells.

most viruses.

bacterial cells.

protozoan cysts.

Which of the following procedures is currently the standard test in the United States for evaluating the efficiency of antiseptics and disinfectants?

phenol coefficient

thermal death point

in-use test

microbial death rate

use-dilution test

Which of the following would be used to sterilize a mattress?

ethylene oxide

formaldehyde

radiation

heavy metals

autoclaving

All of the following have denaturing proteins included in their mechanism of action EXCEPT:

surfactants.

oxidizing agents.

gaseous agents.

heavy metals.

aldehydes.

Which of the following antimicrobial agents is the most toxic to humans?

70% alcohol

chloramines

ethylene oxide

quats

iodophors