The most important function of nitrites in processed foods is to
A. prevent browning.
B. inhibit the germination of Clostridium botulinum endospores.
C. prevent carcinogen formation.
D. make the food more acidic.
Compounds of tin, mercury, arsenic, and copper are no longer used to prevent microbial growth in cooling water primarily because
A. antibiotics are cheaper.
B. other chemicals were shown to be much more effective.
C. microbes developed resistance to these metals.
D. their use contributes to serious pollution of natural waters.
E. All of the choices are correct.
Quaternary ammonium compounds are
A.
cationic detergents that help wash surfaces.
B. attracted to the negative charge on the microbial cell surface.
C. used as a 37 aqueous solution.
D. very effective against Pseudomonas.
E.
cationic detergents that help wash surfaces AND attracted to the negative charge on the microbial cell surface.
Silver sulfadiazine, a combination of silver and a sulfa drug, is used to
A. disinfect water for drinking.
B. prevent infection of surgical wounds.
C. prevent infection of second- and third-degree burns.
D. counteract lead poisoning.
E. treat bites from werewolves.
Which of the following is(are) considered when selecting a germicidal chemical?
A.
Toxicity
B.
Cost
C.
Compatibility with the material being treated
D.
Environmental impact
E. All of the choices are correct.
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