Physical and Chemical Agents
Sweet and salty foods frequently don't require refrigeration to prevent spoilage because they have

toxic alkaline chemicals
high concentration of solutes
low pH
insufficient nutrients

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

Substantially decreases enzymatic activity, slowing microbial reproduction
None of these
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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