Mid 1 Fall 2008

Mid 1 Fall 2008 - 1 of 2 BIS 102 Fall 2008 K Hilt Equations...

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1 of 2 BIS 102 Name__________________________________________________ Fall, 2008 Last First K. Hilt First Midterm Score (100): ___________ Equations: pH = pK a + log {[b]/[a]} K a = x 2 /(y-x) K b = x 2 / (y-x) pH = (pK a 1 + pK a 2 )/2 (K a )(K b ) = 1 x 10 -14 F = (q 1 q 2 ) / r 2 G = H - T S Amino acid pK a ’s: -carboxyl group (2.1), -amino group (9.6) side chains: D (3.9) E (4.2) H (6.0) C (8.3) Y (10.1) K (10.5) R (12.5) Oligopeptide pK a ’s: C-terminal carboxyl group (3.6), N-terminal amino group (7.4) This exam is all about the pentapeptide P-Q-H-K-C. 1. (25 pts.) Draw the complete structure of PQHKC in the form that would predominate at pH 7.5 . 2. (5 pts.) On your structure in question #1, very carefully circle all of the atoms that can participate in hydrogen bonding. 3. (4 pts.) On your structure in question #1, very carefully put rectangles around all of those atoms that can have clathrates of water form around them. 4. (15 pts.) Calculate the net charge, to the nearest 0.01, for the pentapeptide at
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This note was uploaded on 10/21/2009 for the course BIS 52192 taught by Professor Enochbaldwin during the Fall '09 term at UC Davis.

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Mid 1 Fall 2008 - 1 of 2 BIS 102 Fall 2008 K Hilt Equations...

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