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Physical and Chemical Agents

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

Heavy metals
Cationic detergents
Aldehydes
Halogens

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Physical and Chemical Agents
Iodophores are mixture of

iodine and alcohols
iodine and surface active agents
iodine and aldehydes
iodine and phenols

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

Bacillus stearothermophilus
Clostridium perfringens
Clostridium histolyticum
Bacillus cereus

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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
low pH
high concentration of solutes

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Physical and Chemical Agents
Bactericidal concentration of phenol is

0.75%
0.25%
1%
0.5%

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Physical and Chemical Agents
One drawback to the use of ultraviolet light as a sterilizing agent is its

failure to kill microbes in a closed environment
failure to bacterial spores
failure to kill bacteria
failure to kill microbes located in the center of an object

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