Question 1

Typical conditions used for sterilization are

Accepted Answer

A)  100 ∘\circ∘ C for 10 minutes.
B)  12 ∘\circ∘ C at 15 psi for 15 minutes.
C)  80 ∘\circ∘ C for 15 minutes.
D)  72 ∘\circ∘ C for 15 seconds. E) A) and B)
F) All of the above

Question 2

Gamma rays cause biological damage in living systems by

Accepted Answer

A)  producing reactive molecules such as superoxide and hydroxyl-free radicals.
B)  causing tiny gravity sinks and black holes to be formed in the substance.
C)  introducing toxins.
D)  making the substance radioactive.E) A) and B)
F) B) and D)

Question 3

Alcohols are not reliably effective at destroying

Accepted Answer

A)  vegetative bacteria.
B)  enveloped viruses.
C)  non-enveloped viruses.
D)  endospores.
E)  non-enveloped viruses AND endospores.F) B) and E)
G) None of the above

Question 4

Organic acids,such as benzoic acid,are often added to foods to prevent microbial growth.

Accepted Answer

A) True 
 B)False

Question 5

Boiling is very effective at removing most common waterborne pathogens.

Accepted Answer

A) True 
 B)False

Question 6

Prions are easily destroyed by common sterilization procedures.

Accepted Answer

A) True 
 B)False

Question 7

Ethylene oxide is gas that

Accepted Answer

A)  is very useful for sterilizing heat or moisture-sensitive items.
B)  is potentially carcinogenic.
C)  is used as a 37% aqueous solution.
D)  is effective against all microorganisms except endospores and viruses.
E)  is very useful for sterilizing heat or moisture-sensitive items AND is potentially carcinogenic.F) B) and D)
G) None of the above

Question 8

A suffix used to describe a killing action would be

Accepted Answer

A)  -static.
B)  -cidal.
C)  -cillin.
D)  -tion.E) None of the above
F) A) and B)

Question 9

Ultraviolet radiation at the bactericidal wavelength destroy bacteria by

Accepted Answer

A)  destroying endospores.
B)  damaging nucleic acid.
C)  preventing spore formation.
D)  denaturing proteins.E) A) and D)
F) A) and C)

Question 10

Glutaraldehyde

Accepted Answer

A)  is,if given enough time,able to destroy all forms of microbial life.
B)  is very good for use on heat-sensitive medical items.
C)  attacks lipids.
D)  does not affect non-enveloped viruses.
E)  is,if given enough time,able to destroy all forms of microbial life AND is very good for use on heat-sensitive medical items.F) A) and B)
G) A) and C)

Question 11

Microbial death rates may be affected by

Accepted Answer

A)  pH.
B)  temperature.
C)  the presence of organics.
D)  All of the choices are correct.E) All of the above
F) C) and D)

Question 12

Cold and freezing are very effective in killing bacteria.

Accepted Answer

A) True 
 B)False

Question 13

Lister developed his ideas on prevention of infection during medical procedures after studying the work of

Accepted Answer

A)  Koch.
B)  Pasteur.
C)  Jenner.
D)  Fleming.E) B) and D)
F) C) and D)

Question 14

Liquid media containing heat-sensitive components would best be sterilized by

Accepted Answer

A)  ultraviolet (UV) light at 500 nm.
B)  freezing.
C)  lyophilization.
D)  membrane filtration.E) A) and D)
F) A) and C)

Question 15

The most important function of nitrites in processed foods is to

Accepted Answer

A)  prevent browning.
B)  inhibit the germination of Clostridium botulinum endospores.
C)  prevent carcinogen formation.
D)  make the food more acidic.E) A) and B)
F) A) and C)

Question 16

Hydrogen peroxide may be used as a sterilant on living tissue.

Accepted Answer

A) True 
 B)False

Question 17

A common environmental organism that may even grow in certain chemical disinfectants is

Accepted Answer

A)  Escherichia coli.
B)  Streptococcus pneumoniae.
C)  Pseudomonas aeruginosa.
D)  enveloped virus.E) B) and D)
F) B) and C)

Question 18

Nosocomial infections

Accepted Answer

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)  are acquired while in the hospital AND occur because of a susceptible population and presence of disease-causing organisms.F) B) and E)
G) A) and E)

Question 19

Heat treatment is an effective method for sterilization or disinfection of all materials.

Accepted Answer

A) True 
 B)False

Question 20

Which is true of iodine?

Accepted Answer

A)  It does not readily kill endospores.
B)  It may be used as an antiseptic or as a disinfectant.
C)  It is important to use it at the recommended dilution.
D)  It is usually found as tinctures or iodophors.
E)  All of the choices are true.F) B) and C)
G) A) and E)

Exam 5: Control of Microbial Growth

Nosocomial infections

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Cold and freezing are very effective in killing bacteria.

Correct AnswerverifiedShow Answer

Alcohols are not reliably effective at destroying

Correct AnswerverifiedShow Answer

Boiling is very effective at removing most common waterborne pathogens.

Correct AnswerverifiedShow Answer

Heat treatment is an effective method for sterilization or disinfection of all materials.

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Glutaraldehyde

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Prions are easily destroyed by common sterilization procedures.

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Which is true of iodine?

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Ethylene oxide is gas that

Correct AnswerverifiedShow Answer

Typical conditions used for sterilization are

Correct AnswerverifiedShow Answer

Ultraviolet radiation at the bactericidal wavelength destroy bacteria by

Correct AnswerverifiedShow Answer

Organic acids,such as benzoic acid,are often added to foods to prevent microbial growth.

Correct AnswerverifiedShow Answer

Gamma rays cause biological damage in living systems by

Correct AnswerverifiedShow Answer

Microbial death rates may be affected by

Correct AnswerverifiedShow Answer

Hydrogen peroxide may be used as a sterilant on living tissue.

Correct AnswerverifiedShow Answer

Liquid media containing heat-sensitive components would best be sterilized by

Correct AnswerverifiedShow Answer

A suffix used to describe a killing action would be

Correct AnswerverifiedShow Answer

Lister developed his ideas on prevention of infection during medical procedures after studying the work of

Correct AnswerverifiedShow Answer

A common environmental organism that may even grow in certain chemical disinfectants is

Correct AnswerverifiedShow Answer

The most important function of nitrites in processed foods is to

Correct AnswerverifiedShow Answer

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