Only 51 percent of incoming solar radiation actually reaches Earth's surface. Most of the remaining 49 percent of incoming radiation is reflected back to space by
A) clouds and the atmosphere.
B) the ocean's surface.
C) snow and ice.
D) land.
A
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Before clotting factors from recombinant DNA became available, more than half of hemophiliacs in the U.S. acquired HIV from injection of clotting factors obtained from donated blood
a. True b. False Indicate whether the statement is true or false
cDNA
a. does not contain introns. b. is produced from mRNA. c. production utilizes reverse transcriptase. d. begins as a hybrid molecule with an mRNA. e. fits all of these descriptions.
If DNA replication rejoined the two parental strands, it would be termed:a
dispersive. b. gradient. c. semiconservative. d. parental. e. conservative.
Why (if you are careful) are you able to float a needle on the surface of water?
A) Water has adhesive properties. B) The surface tension that is a result of water's cohesive properties makes this possible. C) The covalent bonds that hold a water molecule together make this possible. D) A single needle is less dense than water.