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Physical and Chemical Agents

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

Halogens
Aldehydes
Heavy metals
Cationic detergents

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Physical and Chemical Agents
The lowest temperature that kills all microorganisms in a liquid suspension in 10 minutes is known as the

thermal death temperature
decimal reduction time
thermal death time
thermal death point

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Physical and Chemical Agents
The time required to kill 90% of the microorganisms in a sample at a specific temperature is the

decimal reduction time
thermal death point
D value
F value

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Physical and Chemical Agents
Which disinfectant was the most effective against Salmonella"?

Cetylpyridinium chloride
Merthiolate
Phenol
Hexachlorophene

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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?

Mesophile
Obligate Aerobe
Acidophile
Obligate Anaerobe

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Physical and Chemical Agents
Which of the following is not a disinfectant containing a heavy metal?

Mercurochrome
Silver nitrate
Copper sulfate
Chlorine

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