When there is no arabinose available in the environment, the AraC protein acts as a(n) ________ for the E. coli ara operon.
Fill in the blank(s) with the appropriate word(s).
repressor
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All are true of oyster reefs except
a. they are oriented perpendicular to currents. b. they are concentrated in lower salinity areas. c. they are important habitats for other organisms. d. they are adversely affected by rapid changes in salinity. e. they are increasing in the Chesapeake Bay.
Which of the following represents an activity
within a population?
a. a fox consuming a rabbit b. the absorption of nitrogen by bacteria and converting it to a form useful to plants c. a peacock spreading and shaking his feathers to attract a female d. moss growing on the north side of a large pine tree e. a virus causing rabies in a dog
Which of the following would be most affected by a mutation that prevented cells from forming tight junctions?
A) attachment of cells to the surrounding matrix B) direct flow of water and small molecules from one cell to another C) integrity of the inner lining of the digestive tract D) attachment of the cytoskeleton to the inside of the plasma membrane
Adult Culex pipiens mosquitoes are found above ground in London whereas Culex pipiens molestus mosquitoes are found below ground (in the subway system). These two forms mate in different types of spaces
When forced to cross, no offspring are produced. These two populations are an example of: a. evolutionary species. c. biological species. b. phenetic species. d. phylogenetic species.