mumt - NetID MAKEUPMIDTERMEXAM10/24/10 1. 2. 3. 4. 5. 6. 7....

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Net ID                                                MAKE-UP MIDTERM EXAM 10/24/10 1.                             2.                             3.                             4.                             5.                             6.                             7.                             8.                             9.                             10.                           11.                           12.                           13.                           14.                           15.                                                             TOTAL Use these pK a values unless others are given in a problem: terminal COOH 4 terminal NH 3 + 9 R-GROUPS: Asp 4 Glu 4 Cys 8 Tyr 10 His 7 Lys 10 Arg 12
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BE SURE TO WRITE/PRINT LEGIBLY .  IF WE CAN'T  READ IT, WE CAN'T GRADE IT! PRINT  NAME (LAST, FIRST) ON THE BACK TOP   OF THE LAST PAGE
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1.  (8 pts) Draw the tripeptide Gly-Ala-Gly.  The Ala side chain is CH 3 .  Choose  one  peptide bond, and circle  only   the 6  atoms  that lie in a plane.  Choose  one  of the C α  and draw and label arrows to the bond allowing  Φ  and the bond allowing  Ψ rotation.  Show the correct form of any ionizable groups at pH 7. 2. (2 pts) At pH = 12, the dominant form of Glycine is: a. NH 3 + -CH 2 -COO - b. NH 3 + -CH 2 -COOH c. NH 3 + -CH 3 -COO - d. NH 2 -CH 2 -COO - e. NH 2 -CH 2 -COOH 3. (2 pts) Which of the following describes the overall 3D structure of a single polypeptide chain? a. primary structure b. secondary structure c. the fold d. tertiary structure e. quaternary structure 4. (2 pts) Each of the following is considered to be a weak interaction in proteins, except: a. ion pairs b. peptide bonds c. dipole-dipole attraction d. ring-stacking e. hydrogen bonds
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5. (2 pts) The 3D structure of myoglobin shows that: a. the “ends” of the  α -helical segments all lack Pro b. myoglobin tertiary structure is completely different from hemoglobin tertiary structure c. the structure is compact, with no space inside for bulk water d. the polar and charged amino acid residues are mostly located internally e.  β -sheet structures appear to a minor extent in myoglobin
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This note was uploaded on 01/01/2012 for the course BIOMG 3310 taught by Professor Feigenson during the Fall '11 term at Cornell University (Engineering School).

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mumt - NetID MAKEUPMIDTERMEXAM10/24/10 1. 2. 3. 4. 5. 6. 7....

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