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

Clostridium histolyticum
Bacillus stearothermophilus
Bacillus cereus
Clostridium perfringens

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

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

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