What was the root cause of the decline of kelp beds on the west coast of the U.S.?
A. A decline in the seal and sea otter population.
B. Overfishing of the perch and herring in the area.
C. An explosion of the sea urchin population.
D. A decline in the sea otter population that would control the sea urchin population.
E. An increase in the orca population preying upon the sea otters.
Answer: B
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Which organisms cause “red tides?”
(a) bacteria. (b) cyanobacteria. (c) euglenoids. (d) dinoflagellates.
The olfactory receptors discovered by Richard Axel and Linda Buck are members of a large family of similar receptor molecules termed
A. G-protein coupled receptors. B. ligand-gated ion channels. C. voltage-gated ion channels. D. intracellular receptors. E. serine/threonine proteases.
Trichoplax is a
a. sponge. b. cnidarian. c. placozoan. d. choanoflagellate. e. flatworm.
Which of the following does not characterize arthropods?
A. presence of a coelom B. segmentation C. an open circulatory system D. an exoskeleton E. an incomplete digestive tract