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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?

Obligate Anaerobe
Acidophile
Obligate Aerobe
Mesophile

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Physical and Chemical Agents
Preservation of foods by using salts and sugars works by

lowering osmotic pressure
creating a hypotonic environment
raising pH
creating a hypertonic environment

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

Dry heat
Autoclave
Membrane filtration
Pasteurization

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

Halogens
Heavy metals
Cationic detergents
Aldehydes

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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

thermal death point
decimal reduction time
D value
F value

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Physical and Chemical Agents
For sterilization of which material gamma rays can be used?

Plastic syringes
None of these
Canulas
Catheters

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