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25 - http/www4.ncsu.edu/~knopp/BCH451/e08c3.htm BCH 451...

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BCH 451 Fall 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! 2. a. (3) A = α-D-fructopyranosyl (2-4) β-D-xylulofuranose @ pH = 7 B = α-D-mannopyranosyl (1-3) β-D-ribulofuranose @ pH = 7 C = α-D-galactopyranosyl (1-4) β-D-fructofuranose @ pH = 7 b. (4) D = 1-linolenoyl-2-stearoyl phosphatidyl serine @ pH = 10 E = 1-linoleoyl-palmitoyl phosphatidyl choline @ pH = 10 F = 1-arachindoyl-2-palmitoleoyl phosphatidyl inositol @ pH = 10 c. (3) G = pdAppUp @ pH = 7 H = ppGppdC @ pH = 7 I = pdGppTp @ pH = 7 3. 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: 4. (1.5) Why are proteins present in biological membranes? 5. (0.5) What is the full and complete name of C = cAMP or I = IP 3 ? 6. (3) Describe A = annealing or M = melting in context of nucleic acids and indicate the molecular parameters
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