13 - http/www4.ncsu.edu/~knopp/BCH451/e03c3.htm BCH 451...

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BCH 451 Fall 2003 Exam #3 NAME F = 96.48 kJ/mol-V; k = 1.381 x 10 -23 J/K; N o = 6.022 x 10 23 /mol; R = 8.315 J/mol-K 1. Draw the predominate structures of the following molecules at the pH indicated. Be sure to include all carbon and hydrogen atoms! a. (3) A = α-D-fructofuranosyl (2-4) β-D-mannopyranose; B = α-D-xylulofuranosyl (2-4) β-D-galactopyranose at pH = 9 b. (3) C = 1-lenolenyl-2-palmityl phosphatidyl serine; D = 1-lenolyl-2-stearyl phosphatidyl inositol at pH = 8 c. (4) F = pdApU; G = pGpdC with the purines in the syn and the pyrimidines in the anti conformations at pH = 7 2. (2) It has been observed that DNA is more soluble in water when salt is added. Why would this be correct? 3. Circle the RNA type which is specified on the first page M R SN T a. (0.3) Give the full name: b. (0.5) Give the size(s) or size range of this type of RNA in units of bases: c. (2) Give a complete description of its function within the cell: 4. (1.5) Using galactose as the sugar, draw the “O” linkage to a protein: 5. (1) Why is it called an “O” linkage? 6.
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13 - http/www4.ncsu.edu/~knopp/BCH451/e03c3.htm BCH 451...

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