As a result of _____, an old animal usually has more pollutants in its body than a young one
a. bioaccumulation
b. biological magnification
A
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Which of the following is NOT part of the general response of cells during cellular communication?
A. The cell automatically returns to its normal activities after the signal has exerted its effect. B. A receptor on the outside of the cell binds to a specific signal molecule that it is designed to capture. C. A cell-surface receptor molecule becomes activated by binding to its molecular signal. D. An activated cell-surface receptor transfers the signal to the interior of the cell. E. The signal is carried and amplified inside the cell by binding to a series of specific proteins, affecting cellular activities according to the type of signal involved.
In phage ?, the relative affinities of the lambda repressor and the cro protein to the three binding sites in the OR region are:
A. the same. B. inversely proportional C. unrelated.
The primary pigment molecule needed for photosynthesis is
A. carotenoid. B. chlorophyll b. C. glucose. D. carbon dioxide. E. chlorophyll a.
Which of the following products contain materials
obtained from tropical rain forests? a. tires b. ice cream c. shoes d. toothpaste e. all of these