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

Bacillus stearothermophilus
Clostridium perfringens
Bacillus cereus
Clostridium histolyticum

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Physical and Chemical Agents
Which of the following describes the effect of ionizing radiation on microbes?

Induces electrons and protons to jump out of the molecules of the microbe
Changes the 3-dimensional structure of proteins to a 2-dimen-sional form
None of these
Substantially decreases enzymatic activity, slowing microbial reproduction

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