MCB 354 - Exam I part I - Spring 2008

MCB 354 - Exam I part I - Spring 2008 - NAME _ True-False...

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NAME ________________________________________ 1 True-False (30 points total, 3 points each) Select True or False for the following statements. (One point will be deducted for each wrong answer, so if you got 6 right, 3 wrong, and left one blank, you get 18-3 = 15 points). 1. In protein X-ray crystallography, the level of resolution at which the C, N, and O atoms of an α helix start to be resolved is 1.5Å. A. True B. False 2. The macromolecule being elucidated by X-ray crystallography may be, and often is, smaller than the unit cell of the crystal. A. True B. False 3. The loop of amino acids joining the C-terminal end of a β -strand to the N-terminal end of the α -helix in a β - α - β motif in a globular protein often contains amino acids involved in catalysis. A. True B. False 4. Hydrophobic interactions between proteins in aqueous solution are favored because the number of ordered water molecules surrounding the proteins is maximized, giving the system greater thermodynamic stability. A. True B. False 5. The two substrates that participate in the formation of a peptide bond in the solid phase synthesis of a peptide are a protected amino terminal of a peptide attached to a solid support and a dicyclohexylcarbodiimide-activated, Fmoc-protected amino acid. A. True B. False
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NAME ________________________________________ 2 6. Edmund degradation sequencing involves a nucleophilic attack on phenylthioisocyanate (PITC) by the carboxy-terminal end of the target peptide. A. True B. False 7. Peptide prolyl isomerase catalyzes trans cis isomerism of proline residues, and therefore promotes formation of the β -turns needed for a protein to adopt its folded conformation. A.
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MCB 354 - Exam I part I - Spring 2008 - NAME _ True-False...

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