The oldest well-documented flowering plant fossils are Archaefructus, dating to about
a. 1.5 billion years ago.
b. 420 million years ago.
c. 250 million years ago.
d. 125 million years ago.
e. 17 million years ago.
D
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If the copy number of a proto-oncogene is increased by gene duplication then the proto-oncogene has undergone
A. a missense mutation. B. gene amplification. C. a chromosomal translocation. D. retroviral insertion. E. a nonsense mutation.
__________ line human nasal passages. Fill in the blank(s) with the appropriate word(s)
Monocots, but NOT eudicots, have
a. nodes. b. cotyledons. c. coleoptiles. d. hypocotyl hooks. e. flowers.
Why is it that falcons cannot fly as fast as a fighter jet?
A. Adaptive traits must conform to environmental conditions. B. Natural selection can produce deleterious alleles in individuals. C. Adaptive traits are constrained by historical and genetic factors. D. Not all adaptive traits are heritable.