midterm2008a - Bio 98A Midterm Exam 2/11/08 ID # _ TA Use...

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Bio 98A Midterm Exam 2/11/08 ID # ____________________________ TA Use Only ___________ A term used to describe a molecule that contains both a hydrophobic and a hydrophilic region . .. a clathrate b amphipathic c micelle (1) _______ d bipolar e amphoteric The predominate form of an important buffer in our blood (pH 7.4) is a H 2 CO 3 b HCO 3 - c CO 3 -2 (1) _______ d OH - e H 2 0 An expedition to Mars finds a primitive life form whose proteins are made of various combinations of only three amino acids that were given the single-letter codes of B, J, and X. From the following table, calculate the weighted average residue molecular weight of amino acids in Martian proteins. Amino acid Residue mol wt. Mol% in proteins B 120 20 J 100 30 X 80 50 a 112 b 106 c 100 (2) _______ d 94 e 90 Knowing the amino acid composition (mol% of each amino acid) of a protein would be most helpful in predicting its behavior during _______ chromatography, while knowing the total number of amino acids in the polypeptide would be most helpful in predicting its behavior during _______ chromatography. a ion-exchange; gel-filtration b ion-exchange; affinity c affinity; ion-exchange (1) _______ d affinity; gel-filtration e gel-filtration; ion-exchange To detect peptides eluting from a reversed-phase column, Prof. Dimwit monitors the absorbance at 280 nm instead of 214 nm. Among the few peptides that he detects are those containing at least one . .. a His b Trp c Ser (1) _______ d Cys e Pro
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Bio 98A Midterm Exam 2/11/08 ID # ____________________________ TA Use Only ___________ After cleavage of the polypeptide PSEGK DDNSR FWILK GAPEV with trypsin, 4 peptides were isolated
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This note was uploaded on 03/30/2009 for the course BIOCHEM 98 taught by Professor Mclaughlin,c during the Winter '09 term at UC Irvine.

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midterm2008a - Bio 98A Midterm Exam 2/11/08 ID # _ TA Use...

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