Primary growth involves a(n):
a. increase in length.
b. increase in girth.
c. production of secondary xylem.
d. production of cork cells.
e. division of vascular cambium cells.
a
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Insertion or deletion of a nucleotide in a gene causes a type of mutation called a(n) ____________________ mutation
Fill in the blank(s) with correct word
Most enzymes are composed of ____
a. RNA only b. protein only c. substrate only d. RNA and protein e. protein and substrate
Which graph shows that species diversity is
much less at the equator than at 60 degrees north latitude? a. A b. B c. both d. neither e. not enough data is provided to answer the question
Song and bright colors make male birds conspicuous to predators. The large, gaudy tail of the peacock may be a hindrance in activities such as feeding and flight. Yet these features evolved because of:
a) sexual selection. b) sex-differential survivorship. c) kin selection. d) reciprocal altruism. e) artificial selection.