x1-spr09-key - (a A weak polar interaction between a...

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MCB 450 Spring, 2009 Examination 1 – Answer Key 1. E 2. E 3. C 4. D 5. A 6. D 7. A 8. C 9. D 10. C 11. E 12. D 13. A 14. E 15. C 16. B 17. C 18. D 19. A 20. B 21. pH = pK + log(A-/HA) 9.4 = 9.6 + log(A-/HA) -0.2 = log(A-/HA) 10 0.2 = HA/A- = 1.58/1 = [-NH 3 + ]/[-NH 2 ]
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22. (a) (b) 2 (c) α -carboxyl, α- amino, guanidinium 23. (a) -16.7 kJ/mol G′ = G o ′ + RTln([G6P][ADP]/[Glu][ATP]) = +23.9 + .008314 ∙ 310 ln ([0.083][0.14]/[5.0][1.85]} = -33.9 kJ/mol 24. Facilitated diffusion shows saturation when rate of transport is plotted as a function of concentration. Rate of passive diffusion is a linear function of concentration of the compound transported.
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25. (a) Val, Leu, Ile (b) Sidechains of the hydrophobic residues form hydrophobic interactions with the tails of the phospholipids in the membrane, thereby anchoring the transmembrane protein in the membrane and stabilizing its structure. 26. Many answers are possible. Give credit for any reasonable answer, but deduct credit for wrong statements.
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Unformatted text preview: (a) A weak polar interaction between a hydrogen attached to an element with an unshared electron pair and anyther element with an unshared electron pair. (b) Polypeptide chain in fully-extended conformation having regular hydrogen bonds between peptide hydrogens and carbonyl oxygens. Regular secondary structure. Chains are oriented in the same directions. (c) A disaccharide consisting of a fructose joined to a glucose by a β 1->2 glycoside link. (d) Glycerol backbone esterified to fatty acids at carbons 1 and 2, with a phosphate and an ethanolamine (positively charged nitrogenous base) at carbon 3. (e) An enzyme that will make phosphodiester bonds between two pieces of duplex DNA with blunt ends. 27. Ala-Phe-Asp-Lys-Ser-Phe-Met-Ala Give partial credit for each clue. Reserve 3 points for getting structure entirely correct....
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This note was uploaded on 09/14/2009 for the course MCB 450 taught by Professor Mintel during the Summer '07 term at University of Illinois at Urbana–Champaign.

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x1-spr09-key - (a A weak polar interaction between a...

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