Virulence determinants of H. pylori include:
a. proteases.
b. urease enzyme.
c. hemolysins.
d. exotoxins.
B
H. pylori is an effective and significant bacterial pathogen. Motility allows H. pylori to escape the acidity of the stomach and burrow through and colonize the gastric mucosa in close association with the epithelium. Urease enzyme likely plays a significant role in the survival and growth of H. pylori in the stomach by creating an alkaline microenvironment. Other possible virulence determinants include bacterial adhesins for the colonization of mucosal surfaces, mediators of inflammation, and a vacuolating cytotoxin that causes damage to the host cells.
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A protein is being assembled when
a. DNA is being transcribed b. RNA is being transcribed c. DNA is being translated d. RNA is being translated
Congenital toxoplasmosis can cause all of the following except
A) neurological disabilities. B) anemia. C) convulsions. D) miscarriage or stillbirth. E) deafness.
Minimal protection of specimen, personnel, and environment is accomplished with which class of biological safety cabinet?
a. Class I b. Class II c. Class III d. Class IV
Human populations can grow at a maximum rate of
a. 5% per year. b. 2?5% per year. c. 10% per year. d. 15% per year. e. 20% per year.