Examples of nonpolar signal molecules include ____
a. epinephrine
b. insulin
c. estrogen and testosterone
d. growth factors
e. neurotransmitters
C
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During the DNA replication process, which of the following organisms would have the fewest origins of replication per cell?
A. a Streptococcus bacterium. B. a yeast cell. C. a human. D. a young oak tree. E. a fruit fly.
A(n) ____ is a group of neighboring populations that exchange individuals
a. K-selected species b. Type I species c. r-selected species d. sink population e. metapopulation
The most recent major extinction event ________
a. happened at the end of the Devonian period b. occurred 65 million years ago, when dinosaurs went extinct c. happened at the end of the Triassic period d. is under way now
The greatest volume of blood is found in the
a. aorta and arteries. b. capillaries. c. veins. d. lungs. e. heart