Mid 1 Summer 2009

Mid 1 Summer 2009 - 1 of 2 BIS 102 Summer 2009 K Hilt Name...

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1 of 2 BIS 102 Name__________________________________________________ Summer, 2009 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) 1. (10 pts.) Draw the complete structure of tryptophan, at pH 7, in the space below. Give the one-letter code for this amino acid. Then circle all of the atoms that can participate in hydrogen bonding. Finally, put a rectangle around all of the atoms that waters could form a clathrate around. 2. (10 pts.) 300 ml of 0.450 M NH 3 are mixed with 200 ml of 0.200 M HCl. What is the final pH? The K b of NH 3 is 1.80 x 10 -5 . Put your answer here: pH = _________________. To receive credit, show all of your
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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 Summer 2009 - 1 of 2 BIS 102 Summer 2009 K Hilt Name...

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