Presently, it is thought that organic polymers may have formed and accumulated on:
a. silt and sand.
b. sand and mud.
c. rocks and clay.
d. water and shells.
e. sand and heavy metals.
c
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Which of the following is evidence for evolution in action?
A. The different domesticated breeds of dogs customized for our needs B. Mosquitoes becoming resistant to pesticides C. Bacteria becoming resistant to antibiotics over time D. All are evidence for evolution
Life probably would never have emerged on Earth if
the ancient atmosphere had been the same as the present one in regard to a. carbon dioxide. b. hydrogen. c. oxygen. d. nitrogen. e. carbon monoxide.
One way RNA interference molecules work is by selectively cleaving DNA molecules that have
sequences complementary to small RNA molecules. _________________ Indicate whether the statement is true or false.
If the amount of carbon dioxide in the blood increases,
A. breathing rate increases. B. the pH increases. C. bicarbonate ions are converted to carbonic acid. D. the diaphragm contracts less frequently.