mid_2_summer,_2005 - 1 of 3 BIS 102 Summer 2005 K Hilt Name...

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1 of 3 BIS 102 Name ________________________________________ Summer, 2005 Last First K. Hilt Second Midterm Score (100): ___________ R-group pK a ’s: D (3.9), E (4.2); H (6.0); K (10.5), R (12.5); C (8.3); Y (10.1) The following are true/false questions. Each question is worth 5 points: 1 point for choosing the correct “T” or “F”, 4 points for correctly defending your answer. 1. ______ The most important weak bond for determining stability in 2 o , 3 o , and 4 o protein structure is the hydrophobic effect. 2. ______ Reverse turns are stabilized by a single H-bond, between the R-groups of the first and third amino acid residues that comprise the turn. 3. ______ Proline is rarely found in α -helices and β -pleated sheets. 4. ______ The peptide sequence TWYFWHY might form an α -helix at pH 4. 5. ______ In class, we discussed amino acid analysis of proteins using an ion exchange column and a step elution using a citrate buffer at pH’s 3, 4, and 5. A typical hydrolyzed protein would yield 20 different peaks in such an analysis. 6. ______ Today, protein sequencing is mainly done by the Sanger method.
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