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microbiology chapter 9 potential test questions

front 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

back 1

a. eliminates organisms and their spores or endospores

front 2

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

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

back 2

b. disinfectants

front 3

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

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

back 3

d. sanitization

front 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

back 4

d. all of the above

front 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

back 5

d. all of the above

front 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

back 6

a. Bacillus stearothermophilus

front 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

back 7

d. in use test

front 8

Which of the following items functions most like an autoclave?

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

back 8

d. a pressure cooker

front 9

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

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

back 9

c. desiccation

front 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

back 10

a. electron beams

front 11

Which of the following substances would most effectively inhibit anaerobes?

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

back 11

d. hydrogen peroxide

front 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

back 12

d. aseptic

front 13

Biosafety level 3 includes ___________

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

back 13

a. a double set of entry doors

front 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

back 14

c. decimal reduction time

front 15

Which of the following substances is least toxic to humans

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

back 15

c. hydrogen peroxide

front 16

Which of the following chemicals is active against bacterial endospores?

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

back 16

b. ethylene oxide

front 17

Which of the following disinfectants acts against cell membranes?

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

back 17

a. phenol

front 18

Which of the following disinfectants contains alcohol?

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

back 18

d. a tincture of bromine

front 19

Which antimicrobial chemical has been used to sterilize spacecraft?

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

back 19

d. ethylene oxide

front 20

Which class of surfactant is most soluble in water?

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

back 20

a. quaternary ammonium compounds