23 - 6(2 each List and describe the factors/effects which...

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BCH 451 Fall 2007 Exam #3 NAME 1. (1) Definition: E = effector enzyme; R = receptor; T = transducer 2. Draw the predominate structures of the following molecules at pH = 7. Be sure to include all carbon and hydrogen atoms! (3) A = β-D-ribulofuranosyl (2-4) α-D-mannofuranose; B = β-D-xylulofuranosyl (2-2) α-D-glucofuranose (3) C = 1-stearoyl-2-oleoyl-phosphatidyl inositol; D = 1-palmitoyl-2-linolenoyl-phosphatidyl serine (3) F = pTppddA; G = dCppdGp [purines in syn and pyrimidines in anti ] 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. (0.3 each) List the unique characteristics of P = sphingolipids; T = steroids: 5. (2) How is it possible that fructose is a reducing sugar?
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Unformatted text preview: 6. (2 each) List and describe the factors/effects which stabilize double stranded DNA: 7. (5) Describe in detail the role that C = cAMP; R = RAS; or I = IP 3 plays in the appropriate pathway. Limit your discussion to how this molecule is synthesized/activated, what this molecule affects in the cell and how the “hole in the bucket” applies to this molecule. 8. (2) What are major and minor grooves and how are they important to function? 9. (2) How is signal transduction an example of a cascade? 10. (2) PUZZLER Why do the smaller nucleic fragments travel faster than larger fragments in the dideoxy sequencing gel despite the fact that the charge is less for the smaller fragments? 1 of 1 4/27/2010 4:15 PM...
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