Physical and Chemical Agents
The lowest temperature that kills all microorganisms in a liquid suspension in 10 minutes is known as the

decimal reduction time
thermal death time
thermal death point
thermal death temperature

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

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

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