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Micro Chapter 7
Test Description: Micro Chapter 7
Instructions: Answer all questions to get your test result.
1) Which of the following regarding antimicrobial control agents is FALSE?
A
Alcohols effectively inactivate nonenveloped viruses by attacking lipids.
B
Contaminating organic debris such as blood or sputum decrease effectiveness.
C
Some agents kill by denaturing microbial cell proteins.
D
Some agents affect microbial cell membranes by dissolving lipids.
2) Which of the following does NOT achieve sterilization?
A
ethylene oxide
B
dry heat
C
autoclave
D
pasteurization
3) An agent used to reduce the number of bacteria on a toilet would most accurately be called a(n)
A
disinfectant
B
antiseptic
C
aseptic
D
fungicide
4) 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
denaturing of enzymes
D
damage to nucleic acids
5) Which of the following methods is used to preserve food by slowing the metabolic processes of foodborne microbes?
A
ionizing radiation
B
nonionizing radiation
C
pasteurization
D
freezing
6) What concentration of ethanol is the most effective bactericide
A
50 percent
B
30 percent
C
100 percent
D
70 percent
7) All of the following factors contribute to hospital-acquired infections EXCEPT
A
invasive procedures can provide a portal of entry for bacteria.
B
None of the answers is correct; all of these factors may contribute to hospital-acquired infection.
C
some bacteria metabolize disinfectants.
D
gram-negative bacteria are often resistant to disinfectants.
8) Which of the following results in lethal damage to nucleic acids?
A
All of these
B
radiation
C
heat
D
some chemicals
9) An iodophor is a(n)
A
phenol
B
form of formaldehyde
C
agent that reduces oxygen
D
iodine mixed with a surfactant
10) Ethylene oxide
A
is a sterilizing agent
B
is the active chemical in household bleach
C
requires high heat to be effective
D
is not sporicidal
11) The preservation of beef jerky from microbial growth relies on which method of microbial control?
A
microwaves
B
desiccation
C
supercritical CO2
D
filtration
*select an answer for all questions
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