2006 exam - 2006 Final exam Q1-5: accad Q6. For both the...

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2006 Final exam Q1-5: a c c a d Q6. For both the alpha helix and beta sheet, the number of intramolecular hydrogen bonds between amide hydrogens and carbonyl oxygens is maximized, except the hydrogen bonds in the alpha helix are within that region of the polypeptide whereas the hydrogen bonds for the beta sheet are between respective portions that comprise the beta sheet. The beta sheet prefers smaller amino acid side chains because the R groups can be in the same plane for every third amino acid, whereas for the alpha helix, they are “spun” out. The alpha helix is right handed with 3.6 amino for every turn. The beta sheet exhibits a major periodicity of ~7 angstroms. The collagen triple helix is left handed and quite extended due to the G-X-Y repeat nature in which proline is frequently X or Y. Hydrogen bonds occur between the individual filaments. For most proteins, the major stabilizing force are hydrophobic interactions that lead to numerous hydrogen bonds, which although weak individually, can provide a
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This note was uploaded on 04/13/2008 for the course BIO Biol202 taught by Professor Svitkina during the Fall '07 term at UPenn.

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2006 exam - 2006 Final exam Q1-5: accad Q6. For both the...

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