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102 QUIZ 1 KEY - MCB102 Quiz#1 9/13 Please write your name...

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MCB102 Quiz #1 9/13 Please write your name on the back of the quiz. You may use pencil or pen. Question 1 (6 points) The following is a peptide at pH 7: H H O H O H O H O H O H O ││ ││ ││ ││ ││ ││ H ─ N + ─ C ─ C ─ N ─ C ─ C ─ N ─ C ─ C ─ N ─ C ─ C ─ N ─ C ─ C ─ N ─ C ─ C ─ O - H H─C─CH 3 H CH 2 H CH 2 H CH 2 H H H 2 C CH 2 CH 2 CH 2 SH CH 2 CH 3 S CH 3 1a. For the first 2 amino acids of this peptide, fill out the following table. Full name 3-letter abbreviation 1-letter abbreviation R group classification AA#1: Isoleucine Ile I Nonpolar -0.25 if only said aliphatic AA#2: Phenylalanine Phe F Aromatic -0.25 if only said nonpolar 1b. Draw a triangle around the alpha carbon(s) that is (are) NOT chiral. Alpha carbons are in the backbone and are bonded to N, C=O, H and the R group. Circle the R group(s) of the amino acid(s) often found in tight beta turns. Glycine or Proline are correct -0.25 if backbone N and alpha C circled -0.25 if Cysteine circled (6 th highest probability of being in beta turn) -0.5 if any other amino acid circled Put a box around the R group(s) of the amino acid(s) that can form disulfide bonds.
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