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MT1 08 Sample

# MT1 08 Sample - Page 1 of 3 Spring 2008 Name Last First...

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Page 1 of 3 Spring 2008 Name Last, First Score Biological Sciences 102-001 First Midterm Sample Equations: pH = pK a + log {[b]/[a]}; (K a ) (K b ) = 1 x 10 -14 pH = - log [H + ] Kb = x 2 / (y-x); K a = x 2 /(y - x); pH = (pKa 1 + pKa 2 )/2 Use the following values for pKa’s Compound pK a ’s Phosphate 2.1, 7.2, 12.3 Amino acid side chains (R-group) D 3.9 E 4.2 H 6.0 Y 10.1 K 10.5 C 8.3 R 12.5 Amino acid α -carboxyl group 2.1 Amino acid α -amino group 9.6 Oligopeptide N-terminal amino group 7.4 Oligopeptide C-terminal carboxyl group 3.6 1. If the internal pH of a muscle cell is 6.8, what is the [HPO 4 2- ]/[H 2 PO 4 - ] ratio in this cell? (10pts) S HOW YOUR WORK TO RECEIVE FULL CREDIT . 2. Complete the amino-acid table by marking all the properties applied (10 points) Amino Acid Single Letter Code Hydrophobic Aromatic Ring Charged ( + / - ) Aspartic acid Arginine Tryptophan Lysine K +

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Page 2 of 3 3. Calculate the pH at which the ε -amino group of lysine is 20% dissociated. (10pts) S HOW YOUR WORK TO RECEIVE FULL CREDIT . 4. We use the Henderson-Hasselbalch equation to determine how much strong base to add to a certain quantity of weak acid to make up a buffer at a given pH. Why do we use the
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