Portmess Organic Review 38

Portmess Organic Review 38 - protein. 11. Which of the...

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7. A glycoside is the carbohydrate form of an a. ether. b. acetal. c. aglycone. d. alcohol. 8. Which of the following amino acids is achiral? a. alanine b. glycine c. serine d. cysteine 9. Which of the following is NOT a part of the primary protein structure? a. the amino acid sequence b. the disulfide linkages c. the planar nature of the amide linkage d. the conformation of the polypeptide backbone 10. Which of the following statements about the conformation (secondary and tertiary structure) of proteins is FALSE? a. The four atoms of an amide linkage (–CO–NH–) lie in a plane as a result of resonance between the nitrogen and the carbonyl group. b. Electrostatic attraction occurs between basic and acidic side chains. c. The favored conformation of a protein is always that which has the greatest number of hydrogen bonds. d. The presence of the amino acid proline has the effect of turning a corner in a
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Unformatted text preview: protein. 11. Which of the following statements about an enzyme is FALSE? a. An enzyme is usually a large protein. b. An enzyme is a catalyst for biological reactions. c. An enzyme is a chiral molecule. d. An enzyme changes the equilibrium constant of a reaction. 12. Which of the following statements about the arrangement of a protein in three dimensions is FALSE? a. As a result of hydrogen bonding, a portion of a protein may exist as a right-handed -helix with 3.6 amino acid residues per turn, and a repeat unit of 5.4 . b. As a result of hydrogen bonding a portion of a protein may exist as a pleated sheet, in which the repeat unit is 7.0 . c. In a pleated sheet, the polyamide chains may be parallel or antiparallel. d. A portion of a protein may exist as a flat sheet with a repeat unit of 7.2 ....
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