Physical and Chemical Agents
Preservation of foods by using salts and sugars works by

raising pH
creating a hypotonic environment
lowering osmotic pressure
creating a hypertonic environment

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

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
Substantially decreases enzymatic activity, slowing microbial reproduction
None of these

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