Transport proteins _____
a. are found only in eukaryotic cells
b. allow only small molecules and ions to cross the membrane
c. are required for small nonpolar molecules to cross the membrane
d. allow ions and polar molecules to cross the membrane
e. are peripheral membrane proteins
ANSWER: d
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A. center of gravity B. valence number C. isotope D. nucleus
A taste bud is indicated by
a. A. b. B. c. C. d. A and B. e. none of these; they are olfactory receptors.
Because of genetic differences in people's responses to medications, there are over 100 different types of ____
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A. 4 B. 8 C. 12 D. 16 E. 24