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img102 - ith amino groups iChoose the best answer 1 5 Which...

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Unformatted text preview: ith amino groups. iChoose the best answer) 1 5. Which ofthc following compounds reacts w 'cyclohcxylcarbodiimide DCC l) ' 5010619 " di fi-phthalaldeh} Cit: — F! ‘JU‘I’GJLEI‘. T c) 5.5'_dithiobis(Z-nitrobenzoic acid» tEllnian's reagents) rent“ (“I 5-H d,» cyano gen bromide tCXBri or none of the abOVe Questions 67 and '7 below refer to and requir: the following information: . . . {wear .3 f: t‘ ~é' . A protein 15 treated with the egdopeptidase trapsm. and a number or pept these fragments (labelled ".—\") is treated with 6N1 'HC'. for 45 hours at hig on for A is reported. Note: the list of aminc acids below doc: 22 ide fragments are produced. Ont h temperatures The following at br’imiFIE-"thc sortsgtjsw acid compositi .__,— /, :GLL‘. LEL‘, LYS, 32% para} 3‘; _.. _.... _.__. -_. ._ I'BI' arc formation of No new fragments, "A" with cvanogen bromide resulted in the Treatment of peptide 'B_"J_'S_di5c_oggred to be a tetrapeptide, and "C" is discovered to be homoserine lactone. Treatment of "A"- gments, "D" and "E". "1.)", when reacted with ELL. ’55:“ 1' riichymotrypsinrlso resultedin the‘formation ot‘two fra immediately produced a phenylthiohydantoi'n derivative of glutamic acid. reagent tp en isothiocy'anate), Fragment "E" was discovered to be a tripeptide containing an aromatic amino acid? _ ,,t- . F— ___—————-—-’V—_ r A L4 ' . . . . . 7 l” " ' fl 6. The N-terminal amino acrd of peptide "A" 15: LL —-—" -—' "" r ”M u \ /—\ L" a) glutamic acid. b) leucine. c) lysine. rd) 'ethionine. .. e‘) phenvlalanine. p I; s -i e- ..V e /=: l t 7. The correct sequence ot'"A“ is; QUE 7 x J *2. YS-GLU-LEU-PHE-MET 1?. _ '“" , b) ET—LEU-PHE-GLU-LYS // “'\ ‘ V . ET-LELT-LYS-GLU—PHE " - f, i, E‘ '- u HE—LEU-LYS-GLU-MET D E "" —" C 'e) none ofthe above, 9; not enough information had been given so as to unambig ouslv determine the sequence of A. \ '/ . 4; Si v‘rO'v-nco : ':. 1—- Vfliich of the following is true ofthe helical structures found in proteins? 7: The principal force maintaining the common helical strucmres found in proteins 15 LhC :; drogen-‘ocrzc to the axes ofthe helicespdml‘e‘ ly in elongated. tubular—like proteins; they cannt be found in lobular proteins. tt handed helices. light‘. \ou find that the polar side chains ofthe amino acids :ir a) ./ mans—perpendicular i:- bl Helices are found on 'npnYi/‘l. HA ’1 helices :ound in poly, TM... “a. 1 phfiinr nan—nv‘pifir r-ru L a..- -t ravauu- mA-r .. U 01173155 fwu look down the artis ot a ham. _ “‘ing away from the axis} while the non-pclar side chains are in :h: interior ot :he helix :poin:ir~.g _‘/ / z: .‘> f ""3 c rescs t yo _ r v- uJI’lJJJI‘.’ primer? J :i.ise v. ASiilSSuSSCd1T;Cii;$5,iil: presenCe ot $11,.” _..' at disalfide bonds are cleaved. 31:1; Liner Lino a. . peptide bonds bee». esn methionine v .1‘; -21: wens: 11:: C...~‘r‘.;.:'.:i. ' ' .' . ;. 122.5; “Io-5:33.143 “hex" Durant. r “E; 15.31:: c I) (1311:: CL 11.; ii ...
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