BIBC100-midterm1

BIBC100-midterm1 - 2 Name(last first W I I PLEASE READ THF...

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Unformatted text preview: 2 Name (last. first]: W I I: PLEASE READ THF. QUESTIONS CAREFULLY lllilil'JRli ANSWERING! 1. Show the orientation of the dipole moment ofa water molecule in contact with a sodium ion. Within a hydration shelL what non-covalent interaction can he found between aater molecules“.J What non—cttyalcnt bond is found between water moleeules of the hydration shell and the bulk water molecules-'9' 31;} points fl -— Lil moi-ilk W gghgmhmMCP ID _. - pl imam Mk “Wl'U Owe/l CD Hilfiglx‘ru M Q9 2. What etl‘eet explains the spontaneous formation of fatty acid micelles in uater‘.’ the entropy component ofwhieh part ofthis system plays a determining factor in this etl'ect'?I I|t‘y’liat charge would you expect on a fatty acid nticelle surface at physiological pll knowing that they contain carbonyl acid groups. the same found in L-o-amino acids? 4!] points ijflfitltlac (‘29 (an mar/aw) @ was “a 3. Which solvent promotes a stronger electrostatic attraction between a sodium and chloride ion. a hydrophilic or hydrophobic one? Which parameter in Coulomb's law predicts your ansaer'.’ iAyJLUi flail/1c, Miami (E i i b b m4 cl—lalaohit Nw'lw-«Jt 69 3 Name (last. first} : 3"— 4. Based on the i-tirt'lilarit}r to fatty]r acid micelle fomlation, name an amino acid ot‘your choice and discuss what properties it has that favor micelle formation in aqueous solution. It] points My} 61 «h aw Earth/it. K ._.. Evde M will WIT l'qll 5. Give an amino acid sequence [single letter code] for a negatively charged petite-peptide found in a strand in a beta-sheet 1with amphipatliie properties. r‘tssunie physiological pl | conditions. Select from the following residues; first residue is a leucine: 4t) points i— (Ala. S * . Phe. ile. GILL ('an a 3’ sequencedistributioneipolar and nonvpolar amino acids would you lind in a peptide that forms water soluble 4-helical bundles?I 31'.) points ahflfiu’lm al/‘Whlr‘j’iw “All Wm” M4 M71" li‘l l'l“ 4 Nameilast, Iirsl]: .5 ___— i". Draw a Ramaehandran plot representing a beta-alpha-bcla lncp rnnlil‘. Use cnrrccl labels on berth axis and indicate apprcximate Imatic-n ci‘lursinn angel values fur {his mnlil‘. 3i] points Min «his 41 a 005 8. Give :1 definition of a pretein subunit. Tc- descrEI-tiie'iiaekbcne structure Ufa subuniL which hierarchical Ics-‘el cf pretein structures best represents a single subunit? BU paints Ar funk; Surabaya-i i5 5: Ernie/L (N fibrin-$961) 5 Name (last, first) : fw‘ 9. Describe how one could Show experimcfitally that the melting temperature- ofa DNA sample is a predictur ni‘ its (jJr-C cnntcm. Describe in wards or uae a graph. 41:} points mu. hm fi WIN Jffu wmjkwfiw 01‘ mme bnfiimé {AK Law“ EWC (finkqu Dual .11wa W W :3 Q W“ W“ T» cf“ Hiya; Etc LHLJ‘. 04 CW1 H4 ...
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This test prep was uploaded on 04/07/2008 for the course CHEM 140C taught by Professor Nefzi during the Spring '06 term at UCSD.

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BIBC100-midterm1 - 2 Name(last first W I I PLEASE READ THF...

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