Two important differences between the processes of natural selection and artificial selection are:
a. descent and modification.
b. the selective agent and the traits being selected.
c. the pace of change and the period of time.
d. B and C, but not A.
B
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Cells of complex multicellular organisms often differ in function. Which of the following describes the molecular mechanism that gives rise to different cell types?
A. Cells lose a portion of their genome as they become specialized. B. Cells acquire mutations during the process of differentiation. C. Different cells express different sets of genes. D. Tissues migrate during embryonic development.
In the figure above, representing transcription, the item labeled "E" is
a. the nontemplate strand. b. RNA-DNA hybrid. c. the template strand. d. DNA double helix. e. the RNA copy.
The greatest number of AIDS cases has occurred in
a. North America. b. The Caribbean Islands. c. Latin America. d. Sub-Saharan Africa. e. East Asia.
Dandelions and tent caterpillars, which are r-strategists, are examples of opportunistic species that tend to move in high numbers and rapidly occupy new environments.
Answer the following statement true (T) or false (F)