DDT and mercury
A) were once used as an energy source.
B) contribute to acid precipitation.
C) accumulate in the tissues of organisms.
D) deplete the ozone layer.
Answer: C
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The Northern leopard frog (Rana pipiens) and Southern leopard frog (Rana utricularia) are morphologically similar, but their mating calls sound very different. Based on this, what is the best explanation for why these frogs are considered separate species?
A. They are too morphologically different to interbreed. B. They have undergone behavioral isolation which prevents them from interbreeding. C. They have undergone habitat isolation because one species is entirely terrestrial while the other is entirely aquatic. D. They do interbreed, but produce sterile hybrids.
Dense connective tissue is indicated by the letter ____
a. A b. B c. C d. D e. E
Receptors on the surface of ____________________ T cells recognize the antigens displayed on the surface of an
infected cell. Fill in the blank(s) with the appropriate word(s).
R plasmids often contain genes for antibody production
Indicate whether the statement is true or false