Using the analogy of a 12-hour geologic time
clock
a. prokaryotes appear shortly after 5 a.m.
b. eukaryotes appear at 9 a.m.
c. dinosaurs appear at 10 a.m.
d. early fishes appear at 11 a.m.
e. the first humans appear at 11:59 a.m.
E
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RNA is a ______________
a. polymer b. monomer c. none of the above
The trigger region
a. is the point at which an action potential starts. b. is adjacent to the cell body. c. is part of the axon. d. contains gated channels for sodium and potassium. e. has all of these characteristics
The concept that Earth's present landscape is due to gradual geological processes was proposed by
A) Malthus. B) Aristotle. C) Buffon. D) Lamarck. E) Lyell.
Biological magnification can lead to high levels of mercury and lead in organisms higher in the food chain.
Answer the following statement true (T) or false (F)