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Physical and Chemical Agents

Physical and Chemical Agents
Microbes can be removed from a liquid solution by the process of

desiccation
filtration
freeze-drying
osmosis

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

toxic alkaline chemicals
insufficient nutrients
high concentration of solutes
low pH

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

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Physical and Chemical Agents
Which of the following items could be sterilized by dry heat sterilization?

rubber gloves
Glass pipettes
Intravenous (IV) solution
Plastic IV bags

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Physical and Chemical Agents
Which of the following skin disinfectant(s) is/are most frequently used?

Isopropyl alcohol
none of these
Ethyl alcohol
Both (a) and (b)

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

Cationic detergents
Heavy metals
Aldehydes
Halogens

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