In Lake Victoria, hundreds of cichlid fish species arose after the lake last dried up 12,400 years ago. This is an
example of ____.
a. sympatric speciation
b. the founder effect
c. gene flow
d. genetic drift
e. allopatric speciation
ANSWER: a
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In a reversible chemical reaction at equilibrium, the concentration of X (the reactant) is 0.75 mol/L, and the concentration of Y (the product) is 2.25 mol/L. At 25°C, what would be the Keq?
A) 0.33 B) 3.0 C) 1.69 D) 1.50 E) 37.5
Cells that can detect and respond to a hormone are known as
a. target cells. b. regulator cells. c. receptor cells. d. messenger cells. e. endocrine cells.
How many levels of consumption are depicted
in the figure? a. 1 b. 2 c. 3 d. 4 e. 5
Which of the following terms is associated with the release of nonenveloped or complex viruses from the host cell?
A) Budding B) Exocytosis C) Lysis D) Phagocytosis E) Endocytosis