Pheromones
a. are signaling molecules.
b. are released by one individual and influence
other individuals of the same species.
c. diffuse through the air
d. help to regulate honeybee behavior.
e. do all of these.
Answer: e
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The overall rate of a reaction is dependent on which of the following?
A. the concentration of the product only B. the rate of the slowest or rate-limiting step of the reaction C. the number of steps in a reaction mechanism D. the formation of enzyme-linked intermediates E. the free energy of the surroundings
In their experiments to identify the transforming principle, Avery, MacLeod, and McCarty used enzymes that break
down ____.
a. protein, DNA, and RNA b. protein and RNA only c. DNA only d. protein, lipids, and RNA
e. lipids and DNA onlyWhat 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.
Chordates are characterized by having a ________, a dorsal, flexible supportive rod.
Fill in the blank(s) with the appropriate word(s).