4033q1whitekeysum11

4033q1whitekeysum11 - BCH 4033 Summer 2011 Name: Whit/rt...

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Unformatted text preview: BCH 4033 Summer 2011 Name: Whit/rt ’@ Quiz #1 MM N—number: g/Ml’fiDraw Cys and Trp in their unionized states. React Cys and Trp yielding the product dipeptide Cys-Trp. . Use curved arrows to demonstrate the electron pair movement that leads to the product. M if Q , fm if“ H. H2», 5:3! t M / W Ml... ‘ M612”...— 5, w c «we 4» L c , t t “eh it"??? the K r” B pgf m Véfi a. NAD+ + HS-SH —> NADH + if + S=S ,. ago Wei in??? ._;0_’_)?__ 69324 b. ascorbate + CH2=CH2 —-> CH3-C 13 + dehydroascorbate w at ca: W. ,_r «9.2a f/“3”.‘\List three classes of biological macromolecules that will be studied this semester. For each class provide the organic chemistry name for the bond holding the macromolecule together. gay” . Macromolecule class Organic chemistry name of bond a. “WW 5’1? b. Gayle/9% {EBay-'91 was} «(iHNM-éw c_ lip/ti; t veggie» Draw a dipeptide, aal—aaz, which illustrates a monopole—monopole attraction of R—groups at pH 9.95. Next It? to that dipeptide draw a second dipeptide, aag—aa4, which illustrates a dipole—dipole interacti \of R—groups ‘ I l p ,1; at pH 9.95. Note that all 4 of the amino acids used should be different, noyrepeats. i, J; Vite? p riggté‘lg‘iéfl fi$flwfi 4 ’, ‘72 ‘1 3.. aal-aaz aa3_aa4 R NW (53 mgasasmgpj , U f“ t; WU mt W awfitw v ,r ‘4’ 6 g- 0 _ .gw Wigwawé a? 2} e "5%) * r l u c u 6 W“ 1 tr W, NHL’ c ~ C "ilv ‘O‘CMD all}... é‘li‘a f“; _ l l ' l AA. gag/{t 14 wfiahifihé ilk" AL (ably 6 t? t ' Egg/“W I’ c " t t at: w “0 ; ~ as it . @343?“ H » . . N H‘ a 2m 5 » ' ii: a, ® g L. 'lp’lf’ a!” a égwould be an easy way to purify A from B at pH 3.25? Explain. , 37% in... W 69%. fee. 5, east WWW M”? i i V ‘ _ ' git {39> 544%. ti" (t rag; 4.4% t: wafwf pa; (are: air: l; i (823-: “i {19.5.45 ‘ f rt Wit-afar? aw ' “(at éMé/b fl” betwixt a: w 393% getter} lg: if?” f ._ a... {gm N5..%Given a mixture of two peptides, A is ala—asn-thr-leu-ile and B is glu—leu—thr—trp—his, at pH 3.25. What «a, Elia/fiat Kg tut/er f”"7'“a saga. Hat/tear tithe?“ It?” / fl BCH 4033, Quiz #1, Summer 2011 2 6. Use the axes provided to sketch the titration curve for the tripeptide asp—gly-arg for the [MMpr range 1-14. Label the axes in the boxes provided. List the pks for the peptide. {8%)}: 7. Draw the structures of Au and HA at pH 8.45 for the dipeptide tyr—cys. Label your answers. I .4 i: at flatter .. WW" mg a: mt: tr?“ MWW ' a” \ 8. What is the [PF] ofHCl at pH 4.78? Show all work. . we , N. z a? . ,7 )4 .- 1: ~i" ‘ o . or ,, 5%,? g s a my be I 943% $95?“ ,2) r’v if I C #1191} ‘22: L'Jéé Afr" 9%? M airqtiga ptideéghe-asn-glu-ser? List all the sz for the peptide.W§ ‘ “’2, it e :4” "$.29? 6, r0 @jéag @eaah) » 3w» Show all work. V 3“ \ 15”” g; é «p :2“ ‘ Z mga 10. Find the ratio of [A']/ [HA] for the tripeptide arg-met-his at pH 4.53. Show all work. ‘1: £1 a t , ... .3; g L M flew}, @543? l) fir Q? adv??? “J Li‘vx 3 é’ 00 f”); a? a; W flee? is» .5. 3.; l a; ' r x may 93 égfig {\QMESQ “'m QL g i I, if 11. Draw the D- and L- forms of leucine using a method to depict the stereochemistryf”""“"‘"‘ ' Label your answers. ‘92”? W | g”? S c, W49 Lt” km s it wwftéé‘fk 7::sz \ 6;; Mg \ figs; 69 figs; @1123 ...
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4033q1whitekeysum11 - BCH 4033 Summer 2011 Name: Whit/rt...

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