Which parts of a flower are typically the most leaflike?
a. the receptacles
b. the carpels
c. the sepals
d. the petals
Ans: c. the sepals
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Allopatric speciation requires
a. accelerated gene flow. b. physical separation. c. physical diversity. d. behavioral diversity. e. all of these.
Which of the following mutualisms is a cleaning mutualism in which one species removes ectoparasites from another?
A) corals and zooxanthellae B) bees and flowers C) ants and acacias D) oxpeckers and large mammals
Which enzyme replaces RNA primers with DNA after elongation?
A) DNA polymerase I B) DNA polymerase III C) RNA polymerase D) RNA primase E) DNA ligase
In some cases, just a few hormone molecules binding to the surface of a cell can trigger a very large response because
A. each hormone can bind to multiple receptors simultaneously causing amplification of the signal. B. the signal is amplified by activation of transcription factors that each catalyze multiple reactions. C. the hormone triggers the cell to release more hormones, amplifying the signal. D. the signal is amplified by activation of enzymes that each catalyze multiple reactions. E. each hormone can bind to transcription factors simultaneously causing amplification of the signal.