Chapter 7 Online Quiz

Front 1

Bone and tendons for transplant are decontaminated by

Back 1

Supercritical fluids.

Front 2

Glutaraldehyde is considered one of the most effective disinfectants for hospital use. Which of the following statements about glutaraldehyde is false?

Back 2

. Stains and corrodes

Front 3

If you were preparing nutrient agar at home and didn't have an autoclave, what could you use to sterilize the nutrient agar

Back 3

Pressure cooker at 121°C for 15 minutes

Front 4

Iodophors differ from iodine (I2) in that iodophors

Back 4

All of the above.

Front 5

Place the following surfactants in order from the most effective to the least effective antimicrobial activity:
1-Soap; 2-Acid-anionic detergent; 3-Quats.

Back 5

3-2-1

Front 6

A disk-diffusion test using Staphylococcus gave the following results:

Disinfectant Zone of inhibition (mm)
A 0
B 2.5
C 10
D 5


In Table 7.1, which compound was the most effective against Staphylococcus?

Back 6

10

Front 7

Table 7.2
The fate of E. coli O157:H7 in apple cider held at 8°C for 2 weeks, with and without preservatives, is shown below:

Bacteria/ml
Cider only 2.2
Cider with potassium sorbate 2.0
Sodium benzoate 0
Sorbate + benzoate 0


In Table 7.2, which preservative is most effective?

Back 7

benzoate

Front 8

Table 7.3

The following data were obtained by incubating gram-positive bacteria in nutrient medium + disinfectant for
24 hr, then transferring one loopful to nutrient medium (subculturing). (+ = growth; - = no growth)

Doom K.O.
Dilution Initial Subculture Initial Subculture
1:16 - + + +
1:32 - + + +
1:64 - + + +
1:128 + + + +

Mortum Sterl
Dilution Initial Subculture Initial Subculture
1:16 - - - +
1:32 - + + +
1:64 + + + +
1:128 + + + +


In Table 7.3, which disinfectant was bactericidal?

Back 8

mortum

Front 9

Table 7.3

The following data were obtained by incubating gram-positive bacteria in nutrient medium + disinfectant for
24 hr, then transferring one loopful to nutrient medium (subculturing). (+ = growth; - = no growth)

Doom K.O.
Dilution Initial Subculture Initial Subculture
1:16 - + + +
1:32 - + + +
1:64 - + + +
1:128 + + + +

Mortum Sterl
Dilution Initial Subculture Initial Subculture
1:16 - - - +
1:32 - + + +
1:64 + + + +
1:128 + + + +


In Table 7.3, which disinfectant is the most effective at stopping bacterial growth?

Back 9

doom

Front 10

The antimicrobial activity of chlorine is due to which of the following?

Back 10

The formation of hypochlorous acid

Front 11

Which concentration of ethanol is the most effective bactericide?

Back 11

70%

Front 12

Which of the following could be used to sterilize plastic Petri plates in a plastic wrapper?

Back 12

Gamma radiation

Front 13

Which of the following does NOT achieve sterilization?

Formaldehyde

b. Ethylene oxide

c. Autoclave

d. Pasteurization

Correct

e. Dry heat

Back 13

Pasteurization

Front 14

Which of the following does NOT directly result from application of heat?

Select one:

a. Breaking of hydrogen bonds

b. Denaturing of enzymes

c. Damage to nucleic acids

d. Cell lysis

e. Breaking of sulfhydryl bonds

Back 14

Cell lysis

Front 15

Which of the following is a limitation of the autoclave?

Select one:

a. Cannot be used with glassware

b. Requires a long time to achieve sterilization

c. Cannot kill endospores

d. Cannot be used with heat-labile materials

e. Cannot inactivate viruses

Back 15

Cannot be used with heat-labile material

Front 16

Which of the following is NOT a factor contributing to hospital-acquired infections?

Select one:

a. Some bacteria metabolize disinfectants.

b. Invasive procedures can provide a portal of entry for bacteria.

c. Gram-negative bacteria are often resistant to disinfectants.

d. Bacteria may be present in commercial products such as mouthwash.

e. All of the above may contribute to hospital-acquired infection.

Back 16

All of the above may contribute to hospital-acquired infection.

Front 17

Which of the following is NOT used to disinfect water?

Select one:

a. Ozone

b. Heat

c. Copper sulfate

d. Chlorine

e. Gamma radiation

Back 17

heat

Front 18

Which of the following substances is NOT effective against nonenveloped viruses?

Select one:

a. Alcohol

b. Ozone

c. Ethylene oxide

d. Chlorine

e. All are equally effective.

Back 18

Alcohol

Front 19

Which of the following substances is used for surgical hand scrubs?

Select one:

a. Chlorhexidine

b. Phenol

c. Chlorine bleach

d. Glutaraldehyde

e. Soap

Back 19

Chlorhexidine

Front 20

Which of the following treatments is the most effective for controlling microbial growth?

Select one:

a. 72°C for 15 sec.

b. 140°C for 4 sec.

c. 63°C for 30 min.

d. They are equivalent treatments.

Back 20

They are equivalent treatments.

Front 21

Which of the following will NOT destroy prions?

Select one:

a. Boiling

b. Proteases

c. Incineration

d. NaOH + autoclaving at 134°C

e. All of the above destroy prions.

Back 21

Boiling

Front 22

Which of the following will NOT preserve foods?

Select one:

a. Ionizing radiation

b. Desiccation

c. Osmotic pressure

d. Microwaves

Back 22

microwaves

Front 23

Which of these disinfectants acts by denaturing proteins?

Select one:

a. Aldehydes

b. Alcohols

c. Phenolics

d. Bisphenols

Back 23

Bisphenols

Front 24

Which one of the following does NOT belong with the others?

Select one:

a. Glutaraldehyde

b. Propylene oxide

c. Hydrogen peroxide

Back 24

Hydrogen peroxide

Front 25

Which one of the following is most resistant to chemical biocides?

Select one:

a. Gram-negative bacteria

b. Protozoan cysts

c. Mycobacteria

Back 25

Mycobacteria

Front 26

Which one of the following pairs is mismatched?

Select one:

a. Ozone takes electrons from substances

b. Ionizing radiation hydroxyl radicals

c. Plasma sterilization free radicals

d. Ultraviolet radiation desiccation

Back 26

Ultraviolet radiation desiccation