A protein on a cell surface that binds to a signaling molecule is an example of which of the following elements of cellular communication?
A. a signaling cell
B. a signaling molecule
C. a receptor molecule
D. a responding cell
E. None of these choices are correct.
C
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Unique characters evolve over long periods of time. The time that a particular character arose can be estimated by determining:
A. shared presence of the character in descendants of the population in which the character first arose. B. shared presence of the character in descendants of the population who did not have the character. C. presence of the character in only the most recent species to have it. D. how long the character was in the population.
Which of the following is a possible application of DNA microarrays?
A. cell-specific gene expression B. gene regulation C. elucidation of metabolic pathways D. tumor profiling E. All of the choices are correct.
A provirus:
A) was the first virus discovered by Wendell Stanley at the Rockefeller Institute B) caused the influenza epidemic of 1918 C) is composed of DNA or RNA surrounded by a protein capsid D) infects bacterial cells E) is viral DMA integrated into host DNA
After a trip to several South American countries, a middle-aged man becomes ill. He becomes anemic, loses weight, and runs a fever. The clinician notes a recently healed sore near his nose. Microscopic examination of a blood smear does not reveal anything other than the anemia. What parasitic infection is consistent with this scenario?
A) malaria B) leishmaniasis C) Chagas' disease D) giardiasis E) balantidiasis