Helicobacter pylori is a principal causative agent of
A. gastroenteritis.
B. toxic shock syndrome.
C. human ehrlichiosis.
D. peptic ulcer disease.
Answer: D
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move from the first to the second trophic level?
a. 240 b. 2160 c. 90 d. 10
Craig Venter and Claire Fraser are working to create a "minimal organism.". They are starting with Mycoplasma genitalium, a bacterium that has 517 genes. By disabling its genes one at a time, they discovered that 265–350 of them code for essential proteins. The scientists are synthesizing the essential genes and inserting them, one by one, into an engineered cell consisting only of a plasma
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Which of the following are sugar-transporting cells in angiosperms?
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When DNA replication proceeds along a template, which of the following best describes the directionality of synthesis?
A. in the 3'-to-5' direction B. in both the 3'-to-5' and the 5'-to-3' directions C. in the 5'-to-3' direction D. from the centromere to the telomeres E. from telomere to telomere