Why should we expect to estimate the treatment effect of price on quantity sold to be so difficult in nonexperimental data?
A. Sales taxes create wedges between prices paid and revenue received by the firm.
B. Firms vary their prices strategically in response to expectations of the resulting sales.
C. Obtaining actual quantity information from sales records is difficult.
D. Firms are not likely to keep detailed records of their prices.
Answer: B
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Covalent modification
A) can activate an enzyme. B) affects the activity of an enzyme by adding or removing a chemical group. C) can involve the addition of phosphate groups. D) produces modifications that can sometimes be reversed. E) all of the above
What does the mesoderm have to do with the designation of a true coelom?
A. The mesoderm gives rise to the fluid found within the coelom. B. The mesoderm gives rise to the lining of the coelom. C. The mesoderm gives rise to the outer covering of the coelom. D. The mesoderm gives rise to the structure of the coelom wall. E. The mesoderm has nothing to do with the coelom.
The tropical midlittoral fringe has two zones; they are
a. brown and yellow. b. brown and pink. c. black and white. d. brown and black. e. pink and yellow.
Which of the following is not present during the Calvin cycle?
A. CO2 B. ATP C. NADPH D. O2 E. All are present during the Calvin cycle.