Squirrels tend to have larger body sizes at higher latitudes. This could be an example of
A) acclimation.
B) positive assortative mating.
C) a cline.
D) the Hardy-Weinberg principle.
C
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Cancer can be characterized by:
A. a mass of rapidly dividing cells called a tumor. B. metastasized tumor cells that leave the tumor and invade distant parts of the body. C. cells that express of a type of intermediate filament that is inappropriate for that area of the body. D. cells with an enhanced ability to adhere to proteins in the basal lamina. E. All of these choices are correct.
Imagine you are examining a small mammal that lives under desert conditions and is water deprived. You would predict that levels of the hormone ADH in its blood would be _____ and that its urine would be ______ than its blood.
A. high, more concentrated B. high, less concentrated C. low, more concentrated D. low, less concentrated E. high, no more concentrated
An IgG molecule has two
A. heavy chains. B. light chains. C. antibody binding sites. D. antigen binding sites. E. heavy chains, light chains AND antigen binding sites.
The principal point of Darwin’s theory of evolution
by natural selection is that a. long-term heritable changes in organisms are caused by use and disuse. b. mutations that adapt an organism to a given environment always arise in the greatest frequency in the organisms that occupy that environment. c. mutations are caused by all sorts of environmental influences. d. survival of characteristics in a population depends on a favoring of some forms of a given trait over others in nature. e. mutations mostly have favorable effects.