BIBCF09PS1

BIBCF09PS1 - Problem Set 1 for BIBC 100 Fall 2009 Note: You...

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Unformatted text preview: Problem Set 1 for BIBC 100 Fall 2009 Note: You will not be able to answer all of the questions until after lecture on 10/5/09 1a) What do the pK values in the chart below tell you? Compound pK 1 pK 2 pK R pI Glycine 2.34 9.60 5.97 Glutamate 2.19 9.67 4.25 3.22 Arginine 2.17 9.04 12.48 10.76 The pK values for three amino acids are shown. The pK1 value is fairly close to 2 for all three aa, this is the pH at which the carboxyl group in the aa is equally deprotonated, and the molecule carries a net positive charge. The pK2 values are in the 9-10 pH range, and is representative of the pH at which the carboxyl group is deprotonated, the amino group in the aa is equally deprotonated, and the molecule carries a net negative charge. The pKR value is the point at which a side chain group is equally deprotonated. Note that here is no pKR value for glycine, since its side chain is simply a highly stable hydrogen. The pI stands for the Isoelectric point. At this pH, The concentration of acid is equal to base, and thus stable hydrogen....
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This note was uploaded on 09/04/2010 for the course BIBC 100 taught by Professor Nehring during the Fall '07 term at UCSD.

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BIBCF09PS1 - Problem Set 1 for BIBC 100 Fall 2009 Note: You...

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