Polar bears are top predators, and tests on their
tissues have shown a surprising
a. resistance to warming.
b. amount of protein.
c. resistance to disease.
d. amount of mercury and organic pesticides
e. evidence of none of these.
Answer: d
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_____ are the main male hormones.
Fill in the blank(s) with the appropriate word(s).
About what percentage of the human DNA codes for polypeptides?
a. 2% b. 5% c. 8% d. 50% e. 86%
In which of the following types of waters do seasonal climatic temperature changes result in distinct chemical and microbial stratification?
A. Lakes in temperate areas B. Lakes in tropical areas C. Fast flowing rivers D. Oceans
A eukaryotic gene that is regulated by three activator proteins is said to be under
A. individual control. B. combinatorial control. C. self-regulation. D. elastic control. E. triplet regulation.