Given the role of cross sectional fixed effects in the empirical strategy for identifying causal effects, instead of conducting hypothesis tests of any one coefficient on a fixed effect being zero, it is typical to conduct what sort of hypothesis test?
A. A hypothesis test for a fixed effect coefficient being equal to 1 instead of zero.
B. A joint hypothesis test that the fixed effect coefficients are all equal to the treatment effect.
C. A joint hypothesis test for all of the fixed effect coefficients being equal to zero.
D. A hypothesis test for a fixed effect coefficient being equal to -1 instead of zero.
Answer: C
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Which of the following is not true about energy stored and released in cells?
A. The free energy stored in the phosphodiester bonds of ATP can be used to drive biosynthetic reactions of metabolism. B. ATP can be hydrolyzed to ADP and Pi and the energy released used to form chemical bonds. C. The hydrolysis of ATP results in a large negative change in the free energy. D. ATP can be hydrolyzed to AMP and PPi but the energy released is not used to form chemical bonds. E. All of these statements are true.
The primary function served by erythrocytes is
A. transport of oxygen. B. defense against pathogens. C. buffering against changes in blood pH. D. sealing breaks in the walls of blood vessels. E. transport of water-soluble vitamins.
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A. gene therapy B. DNA fingerprinting C. cloning D. antisense therapy
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