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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: 4. Histones are ______________ that are usually associated with __________________. 5. The Tm for melting the double helix is: 1
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6. All of the following describe the general mechanism of DNA synthesis except : A) One strand is made 5° 3° while the other strand is made 3° 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.
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