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Which one of the following is most resistant to chemical biocides?


A) mycobacteria
B) protozoan cysts
C) gram-positive bacteria
D) gram-negative bacteria
E) viruses with lipid envelopes

F) A) and B)
G) C) and D)

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Which of the following methods is used to preserve food by slowing the metabolic processes of foodborne microbes?


A) pasteurization
B) lyophilization
C) ionizing radiation
D) nonionizing radiation
E) freezing

F) A) and B)
G) C) and E)

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The pH of the medium has no effect on the activity of the disinfectant being applied.

A) True
B) False

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