14 - http/www4.ncsu.edu/~knopp/BCH451/e04a3.htm BCH 451...

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BCH 451 Spring 2004 Exam #3 NAME 1. Draw the predominate structures of the following molecules at the pH indicated. Be sure to include all carbon and hydrogen atoms! a. (2) A = α-D-glucopyranose-1-phosphate @ pH = 7 B = β-D-fructofuranose-2-phosphate @ pH = 7 b. (3) D = 1- stearoyl-2-oleoyl-phosphatidyl inositol @ pH = 9 E = 1-palmitoyl-2-palmitoleoyl-phosphatidyl serine @ pH = 10 c. (3) G = pApddT @ pH = 7 [all bases in syn ] H = pGpddC @ pH = 7 2. PUZZLER The free energy of hydrolysis of acetyl phosphate is measured to be {much greater than, about the same as, lower than} [(0.2) circle the best answer within the braces] the energy of hydrolysis for ATP which is ( 0.3). One of our enterprising classmates did not believe this to be true. So, he obtained some acetyl phosphate and ATP and proceeded to measure the actual values. He was both surprised and pleased to discover that not only that the observed values were much smaller in absolute value but also essentially the same value. He had proved Dr. Knopp was wrong! He rushed into Dr. Knopp’s office to show his results. When asked about the pH of the measurement, he reddened with the realization that he had forgotten to add BUFFER! Real chemists do not use
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