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MICR 290 Final Exam Q&A - West Coast University, Los Angeles
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Microbiology with Diseases by BodySystem, 5e (Bauman) Chapter 9
Controlling Microbial Growth in the
Environment
• Washing dishes in the dishwasher with detergent and hot water is a
process. B) disinfecting
• Which of the following statements is TRUE of
disinfectants?D) They are used on inanimate surfaces.
• You notice a sign in a public restroom that states "Sanitized for your safety." This
meansD) methods of disinfection that meet minimum standards of microbial removal
have been used.
• Which of the following is an example of
pasteurization?C) Heat is used to kill potential
pathogens in apple juice.
• Aseptic means
E) free of pathogens.
• Methods of microbial control called arrest the growth of
microbes. B) microbistatic
• Antimicrobial agents that damage nucleic acids also
affect A
E) protein synthesis.
• A chemical agent that dissolves lipids can
damageE) cells and enveloped viruses.
• An instrument that will come into contact with only the skin of a patient should
bedisinfected with a(n)
B) low-level germicide.
• Which of the following is the most difficult to
inactivate?C) bacterial endospores
• Which of the following describes flash
pasteurization?B) heating at 72°C for 15 seconds
,• Which of the following is
bacteriostatic?B) freezing below 0°C
• Boiling water for 10 minutes is effective in ridding it
ofE) both growing bacteria and enveloped viruses.
• Which of the following is NOT a feature associated with
filtration?C) varying thicknesses of membrane filters used
• Ultra-high-temperature sterilization effectively
D) removes all microbes that cause diseases or spoilage.
• Which of the following types of radiation is nonionizing and has the
shortest wavelength?
• ultraviolet light
• Which of the following is used for microbial control in fresh fruits and
vegetables?E) gamma rays
• Which of the following can be used to reduce microbes in the air of a patient's
room?D) both HEPA filters and ultraviolet light
• Silvadene, a topical treatment for burns, contains 1% silver. What category of
chemicalcontrol agent is in Silvadene?
• heavy metals
• Which of the following is the most appropriate pairing of microbe and biosafety
level?D) methicillin-resistant Staphylococcus aureus (MRSA), BSL-2
• The use of lysozyme during the preparation of cheeses and wines is effective in
reducingthe numbers of
• bacteria.
• Seventy percent alcohol is effective
against A) enveloped viruses.
• Which of the following is a sterilizing
agent?C) peracetic acid
• Quaternary ammonium compounds are disinfectants effective
against E) enveloped viruses.
• Which of the following is used to sterilize items that should not, or cannot, be
exposedto heat or water?
• ethylene oxide
,• What effect do aldehydes have on microbial
organisms?E) They damage proteins and DNA.
• Disinfecting agents naturally produced by microorganisms
areB) antibiotics.
• A chemical agent that kills pathogenic microbes in general is
a(n)B) germicide.
• Which of the following is NOT a desirable characteristic of an ideal
antimicrobialagent?
• It only arrests growth of vegetative cells.
• Why are endospores used to measure the effectiveness of autoclave
sterilization?C) Endospores are very hard to kill.
• A scientist develops a new medication that is a protein compound and that must
be administered by injection. Which of the following would be the most effective and
safest means of preparing a sterile solution of the new medication?
B) filtration
• Which of the following procedures is currently the standard test used in the
UnitedStates for evaluating the efficiency of antiseptics and disinfectants?
• use-dilution test
• Which of the following would be used to sterilize a
mattress?C) ethylene oxide
• Disinfectants that damage membranes
includeE) both alcohol and phenolics.
• Which of the following antimicrobial agents is the most toxic to
humans?B) ethylene oxide
• The process of filtration is
a(n)B) sterilizing method.
• Hydrogen peroxide is an
effectiveD) disinfecting and
sterilizing agent.
• The process of incineration is used
forA) sterilization.
• Alcohols are used for
E) both antisepsis and disinfection.
, • Quaternary ammonium compounds ("quats") are used
forB) disinfection.
• The compound ethylene oxide is used
inB) sterilization.
• Formalin (37% formaldehyde) is used
forE) both disinfection and sterilization.
• Betadine contains what type of chemical
agent?C) halogen
• Gamma irradiation is effective for sterilization because
itE) is penetrating and causes extensive molecular damage.
• Desiccation, a time-honored method of preserving food, is effective because
theE) water content is too low to support metabolic function.
True/False Questions
• Using an alcohol pad before taking a blood sample is an example of
antisepsis. Answer: TRUE
• Protozoan cysts are resistant to many disinfection
methods. Answer: TRUE
• Refrigeration is an effective germicidal
method. Answer: FALSE
• Antimicrobial agents usually work best at high temperatures and high pH
levels. Answer: FALSE
• The phenol coefficient is one of the most widely used measurements of an
antimicrobialagent's effectiveness.
Answer: FALSE
• Lysozyme is effective against nearly all disease causing
agents. Answer: FALSE
• The decimal reduction time is the time required to kill all the microbes in a given
sample. Answer: FALSE
• Slow freezing is more damaging to microbial cells than quick
freezing. Answer: TRUE
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