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Physical and Chemical Agents

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
F value
thermal death point
D value

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

freeze-drying
osmosis
desiccation
filtration

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Physical and Chemical Agents
If a 1:600 dilution of a test compound kills a standard population of Staphylococcus aureus in 10 minutes but not 5 minutes while a 1:60 dilution of phenol kills the population in the same time, what is the phenol coefficient of the test compound?

5
1
50
10

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Physical and Chemical Agents
The time in minutes at a specific temperature needed to kill a population of cells is the

thermal death point
decimal reduction time
F value
thermal death temperature

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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
high concentration of solutes
insufficient nutrients
low pH

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Physical and Chemical Agents
Complete destruction of the microorganisms is commonly known as

disinfection
sterilization
none of these
antisepsis

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