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Chapter 5: Control of Microbial Growth
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1
If an antimicrobial agent is bacteriostatic,
A)complete killing of bacteria occurs with its use.
B)bacteria will resume growth upon removal of the agent.
C)no viable organisms remain after its use.
D)it will kill only spores.
E)it will kill bacteria and inhibit fungi.
2
During the process of pasteurization, food is
A)decontaminated.
B)sterilized.
C)reduced in the number of organisms that can cause spoilage.
D)treated with germicides.
E)normally a long process.
3
The high-temperature-short-time method of treating foods
A)is a form of sterilization.
B)is a form of autoclaving.
C)kills all spores.
D)is a form of pasteurization.
E)none of the above.
4
Autoclaving uses ________ to sterilize.
A)chemicals.
B)short periods of high temperature.
C)steam and pressure.
D)air mixed with steam.
E)none of the above.
5
An intermediate level germicide cannot kill
A)endospores.
B)lipid viruses.
C)fungi.
D)all of the above.
E)none of the above.
6
Ethylene oxide is a germicide that kills by reacting with
A)lipids.
B)DNA.
C)RNA.
D)proteins.
E)the cell wall.
7
Hydrogen peroxide is a useful disinfectant because
A)it leaves no residue.
B)it does not damage plastic or glass.
C)it can be used on living tissue.
D)all of the above.
E)none of the above.
8
Dry heat is used to sterilize:
A)loops in microbiology laboratories.
B)glass pipets.
C)agar media.
D)all of the above.
E)a and b.
9
Gamma irradiation kills microorganisms by
A)directly damaging DNA.
B)producing superoxides.
C)directly damaging lipids.
D)directly damaging proteins.
E)all of the above.
10
Low temperature storage is
A)bacteriostatic for some bacteria.
B)bacteriocidal for some bacteria.
C)viricidal for some viruses.
D)all of the above.
E)none of the above.
11
Which is mismatched?
A)Antiseptic-disinfectant that is non-toxic enough to be used on skin.
B)Germicide-kills bacteria and inactivates viruses.
C)Pasteurization-short heat treatment to kill disease-causing organisms.
D)Bacteriostatic-prevents growth of microorganisms.
E)Decontamination-kills all organisms.
12
The D value refers to
A)the time needed to kill all bacteria on a surface.
B)the time it takes to kill a certain number of microorganisms.
C)the time for 90% of the organisms to die.
D)how long it takes cells to die.
E)none of the above.
13
If a spoon has 10,000 of a certain microbe on its surface and you treat it with a germicide that has a D value of 2 minutes, it will take ____ minutes to sterilize the spoon.
A)10 minutes.
B)20 minutes.
C)4 minutes.
D)cannot be determined from data above.
E)none of the above.
14
The D value may vary based on
A)the microorganism being killed.
B)the area the microbe is in.
C)the time of the treatment.
D)all of the above.
E)a and b.
15
Which of the following is FALSE?
A)Pressurized steam is the only method of heat treatment that reliably kills endospores.
B)Aldehydes are useful in disinfecting living tissues.
C)Filtration cannot remove viruses.
D)Ultraviolet radiation kills by damaging DNA.
E)High salt foods are preserved by reducing available water.
16
Which of the following is FALSE concerning the D value of a specific chemical?
A)It can increase with increased contact time.
B)It may increase with higher temperature.
C)It may decrease in the presence of fats.
D)It may be different at different concentrations of the chemical.
E)It may vary based on the microorganism treated.
17
Which of the following is FALSE concerning the commercial canning process?
A)It uses pressurized steam.
B)It uses a retort.
C)It tries to kill Clostridium botulinum spores.
D)It kills all spores.
E)Cans are heated and the air is exhausted from the can.
18
A sterilant
A)kills mycobacteria.
B)kills fungi.
C)inactivates viruses.
D)kills endospores.
E)all of the above.
19
An aqueous solution of 60% isopropyl alcohol rapidly kills vegetative bacteria and fungi. This solution does not
A)inactivate lipid viruses.
B)evaporate easily from skin.
C)denature proteins.
D)kill endospores.
E)damage lipid membranes.
20
High level disinfectants kill all but
A)fungi.
B)Mycobacteria.
C)naked viruses.
D)endospores.
E)lipid viruses.
21
You are at a grocery store looking at cleaning agents. Each product has a label claiming its effectiveness at controlling microorganisms. Which of the following statements would be an inaccurate claim?
A)Sterilizes as well as steam.
B)Antiseptic on cooking surfaces.
C)Uses gentle soaps to sanitize surfaces.
D)Decontaminates bottles for longer storage of food.
E)Disinfects as well as bleach.
22
You are working in a government laboratory in charge of destroying bioterrorism materials. An envelope containing the spore-forming bacterium anthrax must be disposed of safely. What would be the best method for ensuring the anthrax is killed?
A)Autoclave.
B)Dry heat.
C)Disinfectant.
D)Sanitizing spray.
E)Bleach soaking.
23
You are taking a tour of a municipal water treatment plant. Your guide discusses that the water is sterilized before it is pumped as drinking water. What type of sterilization treatment should you expect to see on the tour?
A)Fluoridation.
B)Iodine treatment.
C)Autoclaving.
D)Ethylene oxide percolation.
E)Ozone treatment.
24
Which of the following best represents Joseph Lister's contribution to modern surgical practices?
A)He invented phenolic sterilizing agents.
B)He found ways to reduce wound infections during surgery.
C)He identified a better way to suture surgical wounds.
D)He found a cure for the gangene disease infecting surgical wounds.
E)He invented surgical dressing applied to wounds after surgery.
25
The sterilization of hospital waste before disposal is very expensive. So, hospital personnel are required to judge whether a waste needs to be sterilized before being disposed. Which would least likely need to be sterilized before disposal?
A)Used needles.
B)Microbiology culture plates.
C)Blood samples.
D)Torn blood pressure cuffs.
E)Used endotracheal tubes.





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