CH369 exam4s03 - Multiple Choice 1. Double-stranded regions...

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Multiple Choice 1. Double-stranded regions of RNA: A) do not occur. B) can be observed in the laboratory, but probably have no biological relevance. C) can form between two self-complementary regions of the same single strand of RNA. D) have the two strands arranged in parallel (unlike those of DNA, which are antiparallel). E) are less stable than double-stranded regions of DNA. 2. In the Watson-Crick model of DNA structure (now called the B-form DNA): A) the 5& end of both strands are at one end of the helix, and both 3& ends are at the other end of the helix. B) the bases occupy the interior of the helix. C) a purine in one strand always hydrogen bonds with a purine in the other strand. D) G-C pairs share two hydrogen bonds. E) A-T pairs share three hydrogen bonds. 3. The DNA in a bacterial (prokaryotic) chromosome is best described as: A) a single linear double-helical molecule. B) multiple linear double-helical molecules. C) a single circular double-helical molecule. D) a single linear single-stranded molecule. E) multiple linear single-stranded molecules. 4. Histones are ______________ that are usually associated with __________________. A) coenzymes derived from histidine; enzymes B) basic proteins; RNA C) acidic proteins; DNA D) basic proteins; DNA E) acidic proteins; RNA 5. The Tm for melting the double helix is: A) The temperature at which the helix starts to open. B) The midpoint of the range over which the helix denatures. C) The temperature at which the helix is completely open. D) The energy needed to melt the DNA. E) None of these is correct. 1
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6. All of the following describe the general mechanism of DNA synthesis except : A) 5&. B) The strands become separated during synthesis. C) Synthesis occurs in both directions from the starting site of synthesis. D) Synthesis of DNA is a very accurate process. E) All of these are correct. 7. Since DNA synthesis is bidirectional from the origin, the number of new strands that are being made simultaneously in E. coli is: A) one B) two C) three D) four E) the answer cannot be determined from this information 8. The mechanism for all template-directed synthesis of any type of nucleic acid involves the following: A) Nucleophilic attack of a 3& hydroxyl toward a nucleoside triphosphate, releasing PPi. B)
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This note was uploaded on 03/30/2010 for the course CH 369 taught by Professor Kbrowning during the Spring '07 term at University of Texas at Austin.

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CH369 exam4s03 - Multiple Choice 1. Double-stranded regions...

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