mumt K - Net ID KEY MAKE-UP MIDTERM EXAM 10/24/10 1. 2. 3....

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Net ID KEY MAKE-UP MIDTERM EXAM 10/24/10 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. TOTAL 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. structural domain 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 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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6. (26 pts) BRIEFLY define the following terms . Detail is not necessary. Mention an example if appropriate but note that an example , by itself , is not a definition. Some definitions will need just a few words. PRINT LEGIBLY!!!! allosteric BINDING AT ONE SITE HAS INFLUENCE AT A DISTANT SITE. ALL CASES IN BIOCHEMISTRY INVOLVE R T TRANSITIONS. holoprotein PROTEIN INCLUDING AS NON-AMINO ACID COMPONENTS protein structural domain THE PACKING OF HELICES, SHEETS, COIL INTO A FOLDING UNIT; EACH PROTEIN III IS MADE UP OF ONE OR MORE STRUCTURAL DOMAINS. THE FOLD IS THERMODYNAMICALLY STABLE.
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mumt K - Net ID KEY MAKE-UP MIDTERM EXAM 10/24/10 1. 2. 3....

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