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Physical and Chemical Agents

Physical and Chemical Agents
Which of the following does not kill endospores?

Hot air sterilization
Pasteurization
Autoclave
Incineration

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

low pH
insufficient nutrients
toxic alkaline chemicals
high concentration of solutes

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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 Anaerobe
Acidophile
Obligate Aerobe

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Physical and Chemical Agents
Steam exposure of a material at 100°C for 20 minutes for three consecutive days is known as

tyndallization
autoclaving
inspissation
none of these

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

Merthiolate
Phenol
Cetylpyridinium chloride
Hexachlorophene

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Physical and Chemical Agents
Which of the following is a limitation of the autoclave?

It lacks the ability to inactivate viruses
It lacks the ability to kill endospores
It takes too long to sterilize
It will destroy heat labile materials

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