The two most important alcohol germicides are ________ and ________.
A. methanol; butanol
B. methanol; isopropanol
C. ethanol; isopropanol
D. ethanol; methanol
Answer: C
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How many hydrogen bonds can a water molecule form?
A. 1 B. 2 C. 3 D. 4 E. 5
A collection of host cells that house different
cloned fragments of DNA is a a. cDNA library. b. transcribed DNA library. c. genomic library. d. gene library. e. plasmid library.
On the Galápagos Islands, the amazing tool-using "woodpecker finch" can modify twigs to pry out grubs. Because there are no true woodpeckers on the Galápagos Islands, this behavior allows this finch to exploit an untapped food source. However, not all members of this species exhibit this behavior, which is probably learned from watching other finches. Therefore,
A. there must be a great advantage to reaching this food source for this learned behavior to be repeated by most descendants of each generation. B. young chicks isolated at hatching will not know how to do this. C. it is probably not "hardwired" in the brain as a behavior passed on genetically. D. All of the choices are correct.
If the frequency of a recessive gene in a population in genetic equilibrium is 40 percent, in the next generation, the frequency of that gene would be ____.
A. 20 percent B. 40 percent C. 80 percent D. 2pq E. unpredictable