Chapter 11 Physical and Chemical Control...
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Chapter 11 Physical and Chemical Control of Microb...
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Page 3
22.
Placing organisms at 4ºC is
a.
bactericidal
d. sterilization
b.
bacteriostatic
e. germicidal
c.
decontamination
23.
Pasteurization
a.
kills all vegetative forms
d. increases food nutrient value
b.
reduces the number of vegetative forms
e. is used to sterilize food products
c.
reduces the number of endospores
24.
What instrument is most effective for pressure-temperature sterilization?
a.
oven
d. Bunsen burner
b.
autoclave
e. incubator
c.
water-bath
25.
Intermittent sterilization, which uses 3 days of lower temperature steam for short periods of
time, is also called
a.
pasteurization
d. disinfection
b.
incubation
e. desiccation
c.
tyndallization
26.
Which of the following is not a primary target of milk pasteurization?
a.
Salmonella
d.
Listeria monoytogenes
b.
Campylobacter jejuni
e.
Brucella
c.
Lactobacillus
27.
Vials of microorganisms that undergo the freeze-drying process called
, will remain
preserved and viable for years.
a.
desiccation
d. pasteurization
b.
flash freeze
e. sterilization
c.
lyophilization
28.
Removal of moisture by dehydration is called
a.
desiccation
d. pasteurization
b.
flash freeze
e. sterilization
c.
lyophilization
29.
radiation excites atoms to a higher energy state within molecules such as DNA that
then leads to the formation of pyrimidine dimers.
a.
infrared
d. particle
b.
ultraviolet
e. ionizing
c.
gamma
30.
Which of the following items are typically irradiated in order to kill microbes?
a.
cured meats
b.
human tissues such as heart valves and skin
c.
operating room air
d.
surgical gloves
e.
All of the choices are correct.
31.
Which control method would not be a suitable choice for killing
Mycobacterium
in a capped
culture tube?
a.
ultraviolet (germicidal) light
d. 160º C for 2 hours
b.
gamma rays
e. All of the choices are correct.


Page 4
32.
HEPA filters are used to remove microbes from
a.
air
d. medical instruments
b.
liquids
e. All of the choices are correct.
c.
human tissues
33.
Filtration sterilization
a.
can remove viruses
d. uses heat and filtration
b.
relies on gravity
e. leaves behind endospores
c.
removes toxins
34.
is a control method that removes microorganisms rather than inhibiting or killing
them.
a.
Boiling
d. Filtration
b.
Sterilization
e. Disinfection
c.
Radiation
35.
Which of the following is not a factor that affects germicidal activity?
a.
material being treated
d. microorganism being treated
b.
length of exposure
e. All of the choices are factors.
c.
strength of the germicide
36.
Iodophors include
a.
chloramines
d. alcohols
b.
betadine
e. chlorhexidine
c.
tincture of iodine
37.
is a halogen used in gaseous and liquid form for large scale disinfection of
drinkingwater and sewage.
a.
Iodine
d. Fluorine
b.
Chlorine
e. Betadine
c.
Bromine
38.
Which of the following is
not
true of chloramines?
a.
contain chlorine
d. are safer than free chlorine
b.
can sanitize and disinfect
e. treat wounds and skin surfaces
c. form trihalomethanes with organic compounds
39.
The compound that is an organic base containing chlorine and two phenolic rings, and is used
increasingly for wound degerming, neonatal washes, hand scrubbing, and prepping surgical
skin sites is
a.
carbolic acid
d. formalin
b.
chlorhexidine
e. quaternary ammonium compounds
c.
tridclosan
40.
Alcohols
a.
denature proteins when in a 50-95%alcohol-water solution
b.
disinfect items when soaking method is utilized
c.
are skin degerming agents
e. All of the choices are correct.
41.
The chemical agent/s that produce/s highly reactive hydroxyl-free radicals and also
decomposes to O
2
gas is
a.
Cidex
d. chlorhexidine
b.
cationic detergents
e. iodophors
c. hydrogen peroxide


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