Helicobacter pylori causes ________.

A. duodenal ulcers
B. stomach ulcers
C. gastritis
D. increased risk for stomach cancer
E. All of the choices are correct.


Answer: E

Biology & Microbiology

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A water sample from a hot thermal vent contained a single-celled organism that had a cell wall but lacked a nucleus. What is its most likely classification?

A) Eukarya B) Archaea C) Animalia D) Protista E) Fungi

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The bones in the forelimbs of a mammal ____

a. can often be traced to a common ancestor b. offer no evidence to support the theory of evolution c. perform the same function no matter which species they are in d. may exhibit either analogy or homology but not both when compared to the forelimb of another animal e. show convergence with some invertebrate structures

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The photosynthetic membrane of Halobacterium salinarium contains ________.

A. archaeochlorophyll B. bacteriorhodopsin C. chlorophyll a and b D. bacteriochlorophyll

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Permafrost, or permanently frozen subsoil, characterizes ________

A) temperate broadleaf forest B) chaparral C) tundra D) coniferous forest

Biology & Microbiology