Micro Chapter 7 Question Preview (ID: 62595)
Micro Chapter 7.
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Which of the following regarding antimicrobial control agents is FALSE?
a) Contaminating organic debris such as blood or sputum decrease effectiveness.
b) Alcohols effectively inactivate nonenveloped viruses by attacking lipids.
c) Some agents kill by denaturing microbial cell proteins.
d) Some agents affect microbial cell membranes by dissolving lipids.
Which of the following does NOT achieve sterilization?
a) pasteurization
b) dry heat
c) autoclave
d) ethylene oxide
An agent used to reduce the number of bacteria on a toilet would most accurately be called a(n)
a) fungicide
b) aseptic
c) antiseptic
d) disinfectant
Application of heat to living cells can result in all of the following EXCEPT
a) breaking of hydrogen bonds
b) decreased thermal death time
c) damage to nucleic acids
d) denaturing of enzymes
Which of the following methods is used to preserve food by slowing the metabolic processes of foodborne microbes?
a) pasteurization
b) nonionizing radiation
c) freezing
d) ionizing radiation
What concentration of ethanol is the most effective bactericide
a) 100 percent
b) 70 percent
c) 50 percent
d) 30 percent
All of the following factors contribute to hospital-acquired infections EXCEPT
a) some bacteria metabolize disinfectants.
b) gram-negative bacteria are often resistant to disinfectants.
c) invasive procedures can provide a portal of entry for bacteria.
d) None of the answers is correct; all of these factors may contribute to hospital-acquired infection.
Which of the following results in lethal damage to nucleic acids?
a) heat
b) radiation
c) some chemicals
d) All of these
An iodophor is a(n)
a) iodine mixed with a surfactant
b) phenol
c) agent that reduces oxygen
d) form of formaldehyde
Ethylene oxide
a) is the active chemical in household bleach
b) is a sterilizing agent
c) requires high heat to be effective
d) is not sporicidal
The preservation of beef jerky from microbial growth relies on which method of microbial control?
a) microwaves
b) filtration
c) desiccation
d) supercritical CO2
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