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Unformatted text preview: Pic tu re 1 1) Which of the following weak acids would make the best buffer at pH = 5.0? (10 pts) a) acetic acid (K a = 1.74 x 10-5 ) b) H 2 PO 4- (K a = 1.38 x 10-7 ) c) Bicarbonate (K a = 6.3 x 10-11 ) d) Tris-hydroxymethyl amino methane (K a = 8.32 x 10-9 ) e) None of the above 2) The structural integrity of supramolecular and biomolecular complexes of multiple components (such as quarternary structure) are bonded to each other by all of the following forces EXCEPT : (5 pts) a) Covalent bonds b) Van der Waals forces c) Hydrogen bonds d) Hydrophobic interactions e) Ionic interactions 3) All of the statements below, about the classification of these amino acids, are correct EXCEPT: (5 pts) a) Y and F are aromatic amino acids b) A and V are nonpolar amino acids c) S and Q are polar, uncharged amino acids d) D and N are acidic amino acids e) K and R are basic amino acids 4) A mixture of 4 amino acids is separated using an anionic exchange resin and an elution gradient of increasing potassium chloride concentration. What would be the correct elution sequence? (10 pts) a) Glu, Leu, Lys, Arg b) Arg, Lys, Leu, Glu c) Lys, Arg, Leu, Glu d) Arg, Leu, Lys, Glu e) Arg, Glu, Lys, Leu 5) The solvent with the highest dielectric constant in this group is:...
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- Winter '08