Target cells for steroid hormones and thyroid hormones do not have membrane receptors for these hormones because
they ____.
a. stimulate the cell by changes in electrical activity
b. are hydrophobic
c. enter the cell by ion channels
d. are small enough to diffuse directly into the cell
e. dissolve readily in the extracellular fluid (ECF)
ANSWER: b
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A genomic library is a collection of:
a. plasmid fragments that are spliced into DNA. b. DNA fragments that are spliced into plasmids. c. intron fragments that are spliced into plasmids. d. exon fragments that are spliced into bacterial cells. e. gene fragments that are spliced into main bacterial chromosom
Which of the following best explains why genetic bottlenecks and founder effects are evolutionarily important?
a) In both cases, strong selective pressures lead to fast directional selection. b) Both result is stabilizing selection due to strong selective pressures. c) Both result in small populations that are influenced more by genetic drift. d) Both result in increased fitness. e) Both result in decreased fitness.
Apes and humans together make up a group called
A. hominoids. B. prosimians. C. habilis. D. hominids. E. Homo sapiens.
Which two countries are both likely to have prevailing winds blowing from west to east?
A. Panama and Brazil B. the United States and Panama C. the United States and Argentina D. Canada and Brazil