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24 - http/www4.ncsu.edu/~knopp/BCH451/e08a3.htm BCH 451...

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BCH 451 Spring 2008 Exam #3 1. Draw the predominate structures of the following molecules at the pH indicated. Be sure to include all carbon and hydrogen atoms! a. (1) C = cAMP; or I = IP 3 at pH = 7: [Draw it on the back of page #1.] b. (4) C = 1-arachidonoyl-2-linoleoyl-phosphatidyl inositol; D = 1-arachidoyl-2-linolenoyl-phosphatidyl choline c. (4) F = pdUpddG; G = TpdAp [pyrimidines in syn and purines in anti ] 2. Circle the RNA type which is specified on the first page: M R SN T a. (0.3) give the full and complete name: b. (0.7) give the size(s) or size range of this type in units of bases: c. (2) give the full description of the function of this type within the cell: 3. (3) Describe how E = hydrophobic effect; B = hydrogen bonds; I = electrostatic interactions; or S = stacking interactions stabilize the DNA double helix: 4. (2) PUZZLER In the Sanger’s dideoxy sequencing procedure, why is 2',3'-dideoxynucleoside triphosphate used instead of 2',5'-dideoxynucleoside triphosphate?
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