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MCQs

Total Questions : 26 | Page 2 of 3 pages
Question 11. Buried hydrophobic side chains in a globular protein fit into a hole formed by the side chains of
  1.    5-7 other amino acids
  2.    9-12 other amino acids
  3.    13-15 other amino acids
  4.    1-3 other amino acids
 Discuss Question
Answer: Option A. -> 5-7 other amino acids
Question 12.  Unpaired H-bond donors and acceptors are found in the hydrophobic core of a protein
  1.    only at the ends of a-helices
  2.    only at the turns connecting p-strands
  3.    only on Pro residues
  4.    rarely
 Discuss Question
Answer: Option D. -> rarely
Question 13.  For the unfolding reaction of Protein G, ΔH° =210.6 kJ/mol, this means that
  1.    unfolding is favored enthalpically
  2.    folding is favored enthalpically
  3.    the entropy is positive at all temperatures
  4.    the entropy is negative at all temperatures
 Discuss Question
Answer: Option B. -> folding is favored enthalpically
Question 14.  Attractive Vander Waals forces occur between
  1.    apolar molecules in the liquid state
  2.    any pair of nearby atoms
  3.    polar molecules in the solid state
  4.    only if other forces are less favorable
 Discuss Question
Answer: Option B. -> any pair of nearby atoms
Question 15.  At the midpoint of a temperature transition curve,
  1.    half of the protein is denatured
  2.    Keq = 1.0 and ΔG = 0
  3.    [Native] = [Unfolded]
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these
Question 16.  Which of the following forces is the most favorable for protein folding?
  1.    Conformational entropy
  2.    Hydrophobic Interactions
  3.    Vander Waals interactions
  4.    Hydrogen bonds
 Discuss Question
Answer: Option B. -> Hydrophobic Interactions
Question 17.  Which of the following is the most correct?
  1.    Charged amino acids are never buried in the interior of a protein
  2.    Charged amino acids are seldom buried in the interior of a protein
  3.    All hydrophobic amino acids are buried when a protein folds
  4.    Tyrosine is only found in the interior of proteins
 Discuss Question
Answer: Option B. -> Charged amino acids are seldom buried in the interior of a protein
Question 18.  Which of the following forces is the most unfavorable for protein folding?
  1.    Conformational entropy
  2.    Hydrophobic interactions
  3.    Vander Waals interactions
  4.    Electrostatic interactions
 Discuss Question
Answer: Option A. -> Conformational entropy
Question 19.  Since ΔG° = -RTlnK
  1.    a 10-fold increase in K decreases ΔG° by about 10-fold
  2.    a 10-fold decrease in K decreases ΔG° by about 2.3*RT
  3.    a 10-fold increase in K decreases ΔG° by about 2.3*RT
  4.    a 10-fold decrease in K increases ΔG° by about 10-fold
 Discuss Question
Answer: Option C. -> a 10-fold increase in K decreases ΔG° by about 2.3*RT
Question 20.  The correlation between free energy ΔG transfer between the aqueous/organic phases and the surface area of amino acid residues
  1.    reflects the reduction in solvent-accessible area during protein folding
  2.    is only meaningful for the polar amino acids
  3.    ignores the important contribution of the peptide bond
  4.    is similar to effects seen with SDS denaturation
 Discuss Question
Answer: Option A. -> reflects the reduction in solvent-accessible area during protein folding

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