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Unformatted text preview: Name: ______________________________________________________________________________ 1 CHEM 340.01: Biochemistry I Exam 1 February 17, 2010 Part I: Eeny, meeny, miney moe…. Page 1 Page 2 Page 3 1 B 7 A 13 B 2 A 8 D 14 D 3 C 9 D 15 C 4 A 10 A 16 B 5 D 11 A 17 D 6 A 12 B 18 B 19 C 20 D Part II: True or False. 21) _ F __ A hydroxyl group can participate in both donation and acceptance because of its lone pair of electrons and covalently bonded hydrogen atom as illustrated below. 22) _ T __ When the occurrence of the 20 amino acids in nature is considered, the weighted average of the amino acids is 128. When a peptide bond forms to join amino acids, a water molecule (MW 18) is lost so the average MW of amino acid residues is 110. 23) _ T __ Glycine is a very flexible residue in peptides. with so many glycines present it is unlikely that a stable helical structure would be formed. 24) _ F ___ At pH 5, positively and negatively charged residues would be spaced 4 residues apart and would be close in space, a favorable interaction. Also, D which will be negatively charged at pH 5 is at the positive end of the helix dipole and H will be positively charged also and it is at the negative end of the helix dipole. Both of these are stabilizing interactions. Name: ______________________________________________________________________________...
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This note was uploaded on 12/04/2011 for the course CHEM 340 taught by Professor T.baird during the Fall '11 term at S.F. State.
- Fall '11