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4033q1bluekeysum11

4033q1bluekeysum11 - BCH 4033 Summer 2011 1 E1 i Name fig W...

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Unformatted text preview: BCH 4033 Summer 2011 1 E1} i Name: fig W 51:75.. Quiz #1 *égjfl. N-number: *5 l. Draw Met and Asn in their unionized states React Met and Asn yielding the product dipeptide Met-A511. Use curved arrows to demonstrate the electron pair movement that leads to the product. g % 6”: ill“ LI {“5 i 12 .A g- 3.1.1.119) l 1:: a 55 P 5.15; N&ffim铧w%wfiwW W (’2. £551.?” ’ filthy. g 5 ~“\ Q ‘5? 6 i A 5. Q, ‘52. é» 1.— Q g M :1 f 55% i 5; 1. a it: [15552]? 2. Label the oxidant (ox) and the reductant (red) in the following reactions. (Assume equilibrium reactions.) 9?”; a. CH3CH20H + FAD —-> FADH + CH3CHO A; 1’ KW 5mg? A3 {19%; 155?’é(;5»;f b. DCIP + ascorbate ._> DCIPH; + dehydroascorbate a 51 55?: i: 5/565 555;. 3 List three classes of biological macromolecules that will be studied this semester. For each class provide {5 .155 the organic chemistry name for the bond holding the macromolecule together. 115.351.1155 w Macromolecule class Organic chemistry name of bond fr” .1 , a. 7? W55 55% 15555 55: Wm55€15 "‘_l!' A 5 .1 ‘55 4 Draw a dipeptide aa1~aaz, which illustrates a monopole monopole replusion of R-groups at pH 3. 25 Next %fii to that dipeptide draw a second dipeptide aa3 aa4, which illustrates a dipole- dipole interaction of R—groups at pH 3. 25 Notei: that all 4 of the amino acids used should be different no repeats. , A - .1 i535 -=~ m”; ,2: z a. aal-aaz b. aa3-aa4 £53514? V1 ‘3 is" would be an easy way to purify A from B at pH 9.15? Explain. .4 551/755 57 5 gthzwt M g? BCH 4033, Quiz #1, Summer 2011 i i 2 6. Use the axes provided to sketch the titration curve for the tripeptide his—val-asp for the -.pH range 1—14. Label the axes in the boxes provided. List the pks for the peptide. fl, ,5" it .2, it: 7. Draw the structures of A and HA at pH 8.9.5 for the dipeptidefl/filys—glu. Label [your answers. Wig 2%” l; t 3‘ '7; a 8. What is the [H+] ofHCl at pH 11.98? Show all work. % , Q. Sgiii’fimééjgg?‘ a? llii‘av gir” a!) ‘w . J K _¢ @\ 9. What is the p1 fowth‘e peptidgwigsala-gly'igg'sef? List all the sz for the peptide. 23. 23?"; Show all work. . .3, - 5;} TM f MM ’ aux-v / , ' @{gtg 10. Find the ratio of [A"]/ [HA] for the tripeptide asp-ala-lys at pH 7.83. Show a t 4,4 #45,! .2 E,» " i? g“? lflf gt”? it; w?“ “It; if?“ a MW. , g , . l , ’ .3 M , . 9 11. Draw the D— and L- forms of tryptophan using a method to depict the stereochemistry. ‘ {jg} ér” \Ww Label your answers. ll ...
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