Microbiology Final/ Chapter 5

Front 1

One of the first chemicals used by Lister to prevent surgical sepsis was
a) alcohol
b) iodine
c) carbolic acid
d) mercury

Back 1

c) carbolic acid

Front 2

the process of killing or removing all the microorganisms in or on a meterial is termed
a) sterilization
b) disinfection
c) sanitation
d) antisepsis

Back 2

a) sterilizationn

Front 3

A sterile item is free of
a) microbes
b) endospores
c) viruses
d) prions
e) A, B, and C

Back 3

e) A, B, and C

Front 4

suffix used to describe a killing action would be
a) -static
b) -cidal
c) -cilllin
d) -tion

Back 4

b) - cidal

Front 5

Pasteurization
a) use of heat to sterilize food products
b) use of heat to reduce pathogenic/spoilage bacteria to a safe level
c) process which uses intense cold to kill microorganisms on food
d) process which uses short burst of radiation to kill microorganisms on food

Back 5

b) use of heat to reduce pathogenic/spoilage bacteria to a safe level

Front 6

plain soap is very effective in controlling spread of microorganism because it is
a) bacteriostatic
b) very effective at the mechanical removal of microorganism
c) virucidal
d) bactericidal

Back 6

b) very effective at the mechanical removal of microorganism

Front 7

Nosocmial infections
a) are acquired at various social events
b) are acquired while in the hospital
c) occur because of a susceptible population and presence of disease causing organisms
d) are acquired at sporting events
e) B and C

Back 7

e) B and C

Front 8

to reduce or eliminate disease/spoilage causing organisms, food is often subjected to
a) heat
b) chemical additives
c) radiation
d) cold
e) all the above are correct

Back 8

e) all the above are correct

Front 9

which of the following organisms are resistant to destruction by typical control methods
a) endospores of Bacillus and Clostridium
b) Pseudomonas
c) naked viruses
d) Mycobacterium spp
e) all of the choices are correct

Back 9

e) all of the choices are correct

Front 10

a common environmental organism that may even grow in certain chemical disinfectants is
a) Escherichia coli
b) Streptocuccus pnemoniae
c) Pseudomonas aeruginosa
d) enveloped virus

Back 10

c) Pseudomonas aeruginosa

Front 11

upon treatment with heat or chemicals, bacteria will
a) all die immediately
b) die at a constant proportion
c) die at an exponential rate
d) die at a geometric rate

Back 11

b) Die at a constant proportion

Front 12

microbial death rates may be affected by
a) pH
b) temperature
c) the presence of organics
d) all of the choices are correct

Back 12

d) all of the choices are correct

Front 13

In order to speed up the sterilization process, which of the following would be useful
a) drying the material
b) washing/mechanical removal of bacteria/organic matter
c) addition of organics
d) nothing
e) B and C

Back 13

b) washing/mechanical removal of bacteria/organic matter

Front 14

moist heat kills microorganisms by
a) irreversible coagulation of proteins
b) destruction of carbohydrates in the cell wall
c) denaturation of nucleic acids
d) dissolving the capsule

Back 14

a) irreversible coagulation of proteins

Front 15

boiling is not reliable for sterilization because
a) heat sensitive instruments may be destroyed
b) heat resistant endospores are unaffected
c) water boils at a higher temperature at lower altitudes
d) viruses are more sensitive to heat than bacteria

Back 15

b) heat resistant endospores are unaffected

Front 16

typical conditions used for sterilization are
a) 100 degrees C for 10 minutes
b) 121 degrees C at 15 psi for 15 minutes
c) 80 degrees C for 15 minutes
d) 72 degrees C for 15 seconds

Back 16

b) 121 degrees C at 15 psi for 15 minutes

Front 17

which of the following is not a sterilization method
a) hot air oven
b) autoclave
c) pasteurization
d) diltration

Back 17

c) pasteurization

Front 18

commercial canning processes
a) geared to destroy Clostridium botulinum spores
b) kill all endospores
c) are especially needed on low acid foods
d) are 12D processes
e) A, C, and D

Back 18

e) A, C, and D

Front 19

a common application of dry heat in the laboratory is to
a) prepare specimens for study
b) sterilize media
c) sterilize plastic
d) sterilize the inoculating loop

Back 19

d) sterilize the inoculating loop

Front 20

ultraviolet radiation at the bacterial wavelength destroy bacteria by
a) destroying endospores
b) damaging nucleic acid
c) preventing spore formation
d) denaturing proteins

Back 20

b) damaging nucleic acid

Front 21

microwaves do not kill organisms directly buy kill by
a) the heat they generate in a product
b) generating free radicals
c) genreating toxins
d) creating thymine dimers

Back 21

a) the heat they generate in a product

Front 22

chemical germicides
a) may react irreversibly with proteins/enzymes
b) may react with cytoplasmic membranes or viral envelopes
c) may be disinfecting or even sterilizing
d) are sensitive to dilution factor, time of contact, and temperature of use
e) all of the choices are correct

Back 22

e) all of the choices are correct

Front 23

the most important function of nitrites in processed foods is to
a) prevent browning
b) inhibit the germination of Clostridium botulinum endospores
c) prevent carcinogen formation
d) make the food more acidic

Back 23

b) inhibit the germination of Clostridium botulinum endospores

Front 24

Which of the foolowing is (are) considered when selecting a germicidal chemical
a) toxicity
b) cost
c) compatibility with the material being treated
d) environmental impact
e) all of the choices are correct

Back 24

e) all of the choices are correct

Front 25

Prions and viroids are easily destroyed by common sterilization procedures
a) true
b) false

Back 25

b) false

Front 26

the more bacteria one starts with, the longer it will take to kill them all
a) true
b) false

Back 26

a) true

Front 27

Heat treatment is an effective method for sterilization or disinfection of all materials
a) true
b) false

Back 27

b) false

Front 28

boiling is very effective at removing most common waterborne pathogens
a) true
b) false

Back 28

a) true

Front 29

Pasteurization results in the sterilization of food products
a) true
b) false

Back 29

b) false

Front 30

generally, heavy metals, except silver, have been proven to be too toxic for use on human tissue and are no longer used medically
a) true
b) false

Back 30

a) true

Front 31

Hydrogen peroxide may be used as a sterilant on living tissues
a) true
b) false

Back 31

b) false

Front 32

cold and freezing are very effective in killiing bacteria
a) true
b) false

Back 32

b) false

Front 33

which of the following is not affected by an antimicrobial procedure
a) cell membrane
b) size of the microbe
c) proteins, such as enzymes
d) DNA

Back 33

b) size of microbe

Front 34

which of the following concerns is the mnost important when choosing an antimicrobial procedure
a) how much time it will take
b) the organism trying to eliminate
c) materials trying to remove organism from
d) the people who will come into contact with the residue from the chemical

Back 34

b) organism trying to eliminate

Front 35

lysol is an acceptable aseptic chemical
a) true
b) false

Back 35

b) false