microbiology chapter 9 potential test questions

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1

in practical terms in everyday use, which of the following statements provides the definition of sterilization?

  1. eliminates organisms and their spores o rendospores
  2. eliminates harmful microorganisms and viruses
  3. eliminates prions
  4. eliminates hyperthermophiles

a. eliminates organisms and their spores or endospores

2

which of the following substances or processes kills microorganisms on laboratory surfaces?

  1. antiseptics
  2. disinfectants
  3. degermers
  4. pasteurization

b. disinfectants

3

which of the following terms best describes the disinfection of cafeteria plates?

  1. pasteurization
  2. antisepsis
  3. sterilization
  4. sanitization

d. sanitization

4

the microbial death rate is used to measure _____________________.

  1. the efficiency of a detergent
  2. the efficiency of an antiseptic
  3. the efficiency of sanitization techniques
  4. all of the above

d. all of the above

5

which of the following statements are true concerning the selection of an antimicrobial agent?

  1. an ideal antimicrobial agent is stable during storage
  2. an ideal antimicrobial agent is fast acting
  3. ideal microbial agents do not exist
  4. all of the above

d. all of the above

6

The endospores of which organism are used as a biological indicator of sterilization?

  1. Bacillus stearothermophilus
  2. Salmonella enterica
  3. Mycobacterium tuberculosis
  4. Staphylococcus aureus

a. Bacillus stearothermophilus

7

A company that manufactures an antimicrobial cleaner for kitchen counters claims that its product is effective when used in a 50% water solution. By what means might scientists best verify this statement?

  1. disk diffusion test
  2. phenol coefficient
  3. filter paper test
  4. in use test

d. in use test

8

Which of the following items functions most like an autoclave?

  1. boiling pan
  2. incinerator
  3. microwave oven
  4. pressure cooker

d. a pressure cooker

9

The preservation of beef jerky from microbial growth relies on with method of microbial control?

  1. filtration
  2. lyophilization
  3. desiccation
  4. radiation

c. desiccation

10

Which of the following types of radiation is more widely used as an antimicrobial technique?

  1. electron beams
  2. visible light waves
  3. radio waves
  4. microwaves

a. electron beams

11

Which of the following substances would most effectively inhibit anaerobes?

  1. phenol
  2. silver
  3. ethanol
  4. hydrogen peroxide

d. hydrogen peroxide

12

Which of the following adjectives best describes a surgical procedure that is free of microbial contaminants?

  1. disinfected
  2. sanitized
  3. degermed
  4. aseptic

d. aseptic

13

Biosafety level 3 includes ___________

  1. double sets of entry doors
  2. pressurized suits
  3. showers in entryways
  4. all of the above

a. a double set of entry doors

14

a sample of E coli has been subjected to heat for a specific time, and 90% of the cells have been destroyed. Which of the following terms best describes this event?

  1. thermal death point
  2. thermal death time
  3. decimal reduction time
  4. none of the above

c. decimal reduction time

15

Which of the following substances is least toxic to humans

  1. carbolic acid
  2. glutaraldehyde
  3. hydrogen peroxide
  4. formalin

c. hydrogen peroxide

16

Which of the following chemicals is active against bacterial endospores?

  1. copper ions
  2. ethylene oxide
  3. ethanol
  4. triclosan

b. ethylene oxide

17

Which of the following disinfectants acts against cell membranes?

  1. phenol
  2. peracetic acid
  3. silver nitrate
  4. glutaraldehyde

a. phenol

18

Which of the following disinfectants contains alcohol?

  1. an iodophor
  2. a quat
  3. formalin
  4. a tincture of bromine

d. a tincture of bromine

19

Which antimicrobial chemical has been used to sterilize spacecraft?

  1. phenol
  2. alcohol
  3. heavy metal
  4. ethylene oxide

d. ethylene oxide

20

Which class of surfactant is most soluble in water?

  1. quaternary ammonium compounds
  2. alcohols
  3. soaps
  4. peracetic acids

a. quaternary ammonium compounds