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Mid 2 Summer 2009

Mid 2 Summer 2009 - 1 of 3 BIS 102 Summer 2009 K Hilt Name...

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1 of 3 BIS 102 Name _____________________________________________ Summer, 2009 Last First K. Hilt Second Midterm Score (100): ___________ Equations: pH = pK a + log {[b]/[a]} 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 entire exam is true/false. Each numbered statement(s) is worth 5 points: 1 pt. for correctly stating T or F in the blank preceding the statement, and 4 pts. for defending your statement. If a statement is false for more than one reason, you need to state all of the reasons. If a calculation is false, you need to give the correct calculation. If a statement is true, you need to explain why it is true. If a calculation is true, you need to show the work that demonstrates that it is true. You may use the back of these pages, but indicate that you are doing so. 1. ______ The most important weak bond in 2 o , 3 o , and 4 o protein structure is van der Waals interactions. 2. ______ Reverse turns are stabilized by a single ionic bond between the R-groups of the first and third amino acid residues that comprise the turn. 3. ______ Proline is rarely found in an -helix. 4. ______ The peptide sequence LWYFWHY might form an -helix at pH 5. 5. ______ An -helix in a protein that had 18 residues in it would form 6 turns and have 10 H-bonds.
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