The preference of female cichlid fish for brightly colored blue or red males in Lake Victoria provides an example of
____.
a. sympatric speciation
b. sexual selection
c. allopatric speciation
d. reproductive isolation
e. ecological speciation
ANSWER: b
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A student clones a DNA insert into the SalI site of pBR322 . Select all answers that describe the media on which she could expect growth of E. coli containing the recombinant plasmid
A. nutrient agar with ampicillin B. nutrient agar with tetracyline C. nutrient agar with ampicillin and tetracycline D. nutrient agar with streptomycin E. nutrient agar with no antibiotics
Gene therapy has been used successfully to treat which of the following genetic disorders in humans?
a. hemophilia A b. cystic fibrosis c. SCID-X1 d. retinal disease
Specific recognition between cell types such as leukocytes and endothelial cells of blood vessels is mediated by cell-surface glycoproteins called
a. selectins. b. fibronectins. c. spectrins. d. porins.
The tracheal system of insects __________.
cb. is stiffened with chitinous rings and leads into the lungs c. is filled by positive pressure breathing d. ramifies along capillaries of the circulatory system for gas exchange e. provides an extensive, fluid-filled system of tubes for gas exchange