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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 Aerobe
Mesophile
Obligate Anaerobe
Acidophile

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

Heavy metals
Halogens
Aldehydes
Cationic detergents

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Physical and Chemical Agents
Which of the following has most heat resistant spores?

Bacillus stearothermophilus
Bacillus cereus
Clostridium perfringens
Clostridium histolyticum

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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

F value
D value
thermal death point
decimal reduction time

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Physical and Chemical Agents
Which of the following was the first widely used antiseptic and disinfectant?

Iodine
Alcohol
Phenol
Chlorine

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Physical and Chemical Agents
Ethylene oxide is used to destroy or kill which of the following microbes?

Fungi
Bacteria
All of these
Spores

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