CH04_with_answers - Chapter 4 The ThreeDimensional...

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Chapter 4   The Three-Dimensional Structure of Proteins Multiple Choice Questions 1. Overview of protein structure Pages: 117 - 118Difficulty: 1 Ans: D All of the following are considered “weak” interactions in proteins,  except:   A) hydrogen bonds.  B) hydrophobic interactions.  C) ionic bonds.  D) peptide bonds.  E) van der Waals forces. 2. Overview of protein structure Pages: 117 - 118Difficulty: 2 Ans: A The most important contribution to the stability of a protein’s conformation appears to be the:  A) entropy increase from the decrease in ordered water molecules forming a solvent shell around it. B) maximum entropy increase from ionic interactions between the ionized amino acids in a protein.  C) sum of free energies of formation of many weak interactions among the hundreds of amino acids  in a protein.  D) sum of free energies of formation of many weak interactions between its polar amino acids and  surrounding water. E) stabilizing effect of hydrogen bonding between the carbonyl group of one peptide bond and the  amino group of another. 3. Overview of protein structure Page: 118 Difficulty: 1 Ans: D In an aqueous solution, protein conformation is determined by two major factors.  One is the  formation of the maximum number of hydrogen bonds.  The other is the:  A) formation of the maximum number of hydrophilic interactions.  B) maximization of ionic interactions.  C) minimization of entropy by the formation of a water solvent shell around the protein.  D) placement of hydrophobic amino acid residues within the interior of the protein. E) placement of polar amino acid residues around the exterior of the protein.  4. Overview of protein structure Page: 119 Difficulty: 2 Ans: D Which of the following best represents the backbone arrangement of two peptide bonds?  A) C α —N—C α —C—C α —N—C α —C  B) C α —N—C—C—N—C α  
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Chapter 4   The Three-Dimensional Structure of Proteins C) C—N—C α —C α —C—N  D) C α —C—N—C α —C—N  E) C α —C α —C—N—C α —C α —C  5. Protein secondary structure Pages: 120 - 121Difficulty: 2 Ans: A In the  α helix the hydrogen bonds:  A) are roughly parallel to the axis of the helix.  B) are roughly perpendicular to the axis of the helix.  C) occur mainly between electronegative atoms of the R groups.  D) occur only between some of the amino acids of the helix.  E) occur only near the amino and carboxyl termini of the helix.  6. Protein secondary structure Page: 120 Difficulty: 2 Ans: B In an  α  helix, the R groups on the amino acid residues:  A) alternate between the outside and the inside of the helix.  B) are found on the outside of the helix spiral. 
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This note was uploaded on 10/10/2009 for the course BCH 461 taught by Professor Lefler during the Spring '08 term at ASU.

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CH04_with_answers - Chapter 4 The ThreeDimensional...

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