What can be removed from pre-mRNA during alternative splicing?
a. exons and ribosomal binding sites
b. ribosomal binding sites
c. exons only
d. introns only
e. exons and introns
ANSWER: e
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A phylogenetic tree is a
A. hypothesis about the evolutionary history of a species. B. guess about the evolutionary history of a species. C. factual representation of the evolutionary history of a species D. detailed timeline of a species' evolutionary history. E. none of these
There is evidence that increased levels of CO2 in the atmosphere may increase Earth's surface temperature. How might this affect the spread of mosquitoes and malaria? Select all that apply
A. Warmer temperatures may increase the habitat range of mosquitoes. B. Warmer temperatures may result in malaria cases in new regions. C. Warmer temperatures will have no affect on mosquitoes or the incidence of malaria. D. Warmer temperatures will kill off mosquitoes, thereby decreasing malaria cases.
The ________ of a virion determines the type of cell it enters
A) nucleic acid B) matrix proteins C) glycoproteins D) lipid molecules E) shape
Which purine base forms 3 hydrogen bonds when binding its complementary nucleotide base?
A. uracil B. cytosine C. thymine D. guanine E. adenine