How do the pyramids of biomass for Silver Springs, Florida, and the English Channel compare?
a. They are both typical of most ecosystems.
b. They both indicate that producers are quickly eaten by herbivores.
c. The pyramid for Silver Springs is typical of most ecosystems and the English Channel pyramid indicates that
producers are quickly eaten by herbivores.
d. The pyramid for Silver Springs indicates that producers are quickly eaten by herbivores, and the English
Channel pyramid is typical of most ecosystems.
e. Both pyramids indicate overgrowth of producers.
ANSWER: c
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During the elongation step of translation, ____
a. the small ribosomal subunit pairs with an anticodon b. amino acids are added to a growing polypeptide chain c. methionine is inserted at the beginning of all proteins d. mRNA is transformed into tRNA e. release factors bind to stop codons
The chemical difference between dideoxyribonucleotides used in Sanger sequencing and the deoxyribonucleotides
normally found in DNA is the presence of a(n) _____ in the deoxyribose sugar of dideoxyribonucleotides.
a. 3' – H rather than – OH b. 5' – H rather than – OH c. 5' – OH rather than – H d. 5' – H rather than – OH e. 3' – COOH rather than – OH
Biramous appendages in arthropods are only present in which organism?
a. insects b. arachnids c. centipedes d. crustaceans e. horseshoe crabs
Suppose the U.S. Federal Reserve raised its interest rate by 1 percentage point between 2014 and 2015, but the Bank of Canada made no change in its interest rate. You estimate the following model in an attempt to assess the effect of the change in interest rate on the unemployment rate:Unemploymentit = ?0 + ?1U.S.it + ?2Y2015it + ?3U.S.it × Y2015it + UitHere, U.S.it is a dummy variable equaling one if the observation is in the U.S. and Y2015it is a dummy variable equaling one if the observation is in 2015. Which of the following variables may generate an endogeneity problem when attempting to use the estimate for the diff-in-diff (?3) as the effect of the interest rate change?
A. The difference in average labor force participation between U.S. and Canada B. Changes in international immigration laws between 2014 and 2015 C. Changes in overall level of trade in North American between 2014 and 2015 D. Changes in the U.S. fiscal policy between 2014 and 2015