Up to 70% of travel-associated gastrointestinal diseases are caused by
A. enterotoxigenic strains of E. coli.
B. Salmonella.
C. Shigella dysenteriae.
D. E. coli 0157:H7.
E. enteroinvasive E. coli.
Ans: A. enterotoxigenic strains of E. coli.
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In the single circulation of a fish, _______ and _________ are present.
A. one atrium, one ventricle B. two atria, one ventricle C. two atria, two ventricles D. one atrium, two ventricles E. no atrium, one ventricle
Which of the following processes does NOT serve to
maintain low pressure at the receiving end of sieve tube pipelines? a. sucrose conversion into cell-wall polysaccharides b. sucrose conversion into starch in the receiving regions c. sucrose conversion to glucose, which is then used in cellular respiration d. activity of companion cells e. conversion of sucrose to fructose in fruits
Which of the following describes flash pasteurization?
A) heating at 63°C for 30 minutes B) heating at 72°C for 15 seconds C) heating at 72°C for 15 minutes D) heating at 134°C for one second E) passing liquid through steam at 140°C
Proteins contain both acidic and basic R groups and can, therefore, function as
A. energy storage macromolecules. B. structural macromolecules. C. buffers. D. catalysts. E. genetic material.