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Physical and Chemical Agents

Physical and Chemical Agents
If a canning procedure is not properly followed, which type of microbe is most likely to grow in the canned food?

Acidophile
Obligate Aerobe
Obligate Anaerobe
Mesophile

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Physical and Chemical Agents
Which of the following disinfectants act by disrupting microbial membranes?

Halogens
Cationic detergents
Heavy metals
Aldehydes

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Physical and Chemical Agents
Which disinfectant would be most effective against Staphylococcus found in a blood spill?

Phenol
Hexachlorophene
Cetylpyridinium chloride
None of these

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Physical and Chemical Agents
One drawback to the use of ultraviolet light as a sterilizing agent is its

failure to kill bacteria
failure to kill microbes located in the center of an object
failure to bacterial spores
failure to kill microbes in a closed environment

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Physical and Chemical Agents
Which of the following is best to sterilize heat labile solutions?

Pasteurization
Autoclave
Membrane filtration
Dry heat

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Physical and Chemical Agents
Sweet and salty foods frequently don't require refrigeration to prevent spoilage because they have

insufficient nutrients
high concentration of solutes
toxic alkaline chemicals
low pH

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