A rapid method of speciation that has been important in the history of flowering plants is
A) genetic drift.
B) paedomorphosis.
C) a mutation in the gene controlling the timing of flowering.
D) behavioral isolation.
E) polyploidy.
Answer: E) polyploidy.
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Viral envelopes are composed of
A. lipids. B. carbohydrates. C. proteins. D. All of the choices are correct.
Gene flow counters the effects of
a. natural selection. b. mutation. c. genetic drift. d. all of these. e. none of these.
Endophytic fungi
a are parasitic fungi that live inside the leaves and stems of most plants. b. are symbionts that live inside the leaves and stems of most plants. c. are parasitic fungi that live inside the cells of most animals. d. are fungi that live inside the cells of other fungi. e. cause disease in important grasses such as fescue.
What is the atomic mass of an atom that has 6 protons, 6 neutrons, and 6 electrons?
A) 6 B) 8 C) 12 D) 18