How many different bases can be found in tRNA molecules?
A) 2
B) 3
C) 4
D) more than 4
D
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The U.S. Department of Energy estimates that wind farms at favorable sites in North Dakota, South Dakota, Kansas and Texas
a. could meet the electricity needs of the western half of the United States, minus Alaska and Hawaii b. could meet the electricity needs of these four states, thereby reducing draw of electrical power from hydroelectric dams c. could meet the electrical needs of the northern plains states during the summers, but not the winters d. could more than meet the electricity needs of the lower 48 states e. could meet the electricity needs of the 48 states during the summers if air conditioning use in private homes was reduced
Seed crops and vegetatively reproduced crops seem to have different major cultural hearths. Which form of domestication of plants is most closely associated with the tropics and humid subtropics?
A. seed crops B. vegetatively reproduced crops C. neither one D. both
The primary anthropogenic source of atmospheric carbon dioxide (CO2 ) is
A) clearing and burning land. B) rice farming. C) respiration. D) burning of fossil fuels.
Despite the Marine Mammal Protection Act, several countries would like to resume unrestricted whaling again. This graph suggests that, if this was allowed,
1.the largest whales would disappear first.
2.there are no more big whales left to catch.
3.whale harvest increases after global war ceases.
4.fin whales are most abundant and should be hunted first.