Throughout most of human history, human population size ________
A) was at carrying capacity
B) grew very slowly
C) showed boom-and-bust cycles
D) skyrocketed
B
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The primary pacemaker of the heart is the
(a) bicuspid valve. (b) tricuspid valve. (c) aorta. (d) sinoatrial node.
Mutational hot spots occur most often where the DNA is
A) unwound and stretched. B) repetitive or symmetrical. C) highly coiled. D) bound by RNA polymerase.
Two amino acids of the standard 20 contain sulfur atoms. They are:
A) cysteine and serine. B) cysteine and threonine. C) methionine and cysteine D) methionine and serine E) threonine and serine.
Two populations of plants look identical but their flowers are fertilized by different pollinators-one by a night-flying hummingbird moth, the other by honeybees. These two populations of flowers are examples of
A) identical gene pools. B) different species. C) identical evolutionary paths. D) the same species using different pollinators. E) groups within the same species.