9 - http/www4.ncsu.edu/~knopp/BCH451/e01c3.htm BCH 451 Fall...

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BCH 451 Fall 2001 Exam #3 Some constants: 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. (0.5) Define metabolite: 2. (1) Why would a co-substrate not be considered a metabolite? 1. Draw the predominate structures of the following molecules at the pH indicated. Be sure to include all carbon and hydrogen atoms! a. (4) Structure #1 in the syn conformation at pH = 7.5 : A = pGppdT; B = pAppdU b. (3) Structure #2 at pH = 6.5 C = 1-palmitoyl-2-linolenoyl phosphatidyl choline; D = 1-palmitoleoyl- 2-linoleoyl phosphatidyl ethanolamine 2. (1) What is the difference between passive transport and simple diffusion? 3. (2) PUZZLER What experiment could you propose which would determine whether water passed through cell membranes by passive transport or simple diffusion? 4. Circle the RNA type which is specified on the first page: M R SN T a. (0.3) Give the full name: b. (0.2) Give the approximate % composition in the cell: c. (0.5) Give the size(s) or size range of this type in bases: d. (2) Give a complete description of its function within the cell: 5. (2) Draw a well labeled diagram which shows how G proteins are considered to operate within the cell: 6. (2) Assuming that the standard free energy of hydrolysis of phosphoarginine is -32 kJ/mol, what is the free energy for hydrolysis at pH = 7.2 and 25 o
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