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MCQs

Total Questions : 68 | Page 6 of 7 pages
Question 51. . Which of the following statements is incorrect?
  1.    Protein G contains both a-helix and P-sheet
  2.    Protein G contains only a-helix
  3.    Fatty acid binding protein contains largely P-sheet
  4.    Hemoglobin contains four sub-units
 Discuss Question
Answer: Option B. -> Protein G contains only a-helix
Question 52. . The oxygen binding curves of hemoglobin and myoglobin
  1.    allow maximum transfer of oxygen to the tissues
  2.    are a consequence of the quaternary structure of hemoglobin
  3.    both (a) and (b)
  4.    are identical
 Discuss Question
Answer: Option C. -> both (a) and (b)
Question 53. . Which of the following statement is incorrect?
  1.    Hemoglobin and myoglobin are the two oxygen binding proteins
  2.    Hemoglobin transports O2 in the blood
  3.    Myoglobin stores O2 in muscles
  4.    None of the above
 Discuss Question
Answer: Option D. -> None of the above
Question 54. .  The nature of peptide bond can be best explained as
  1.    partial double bond
  2.    truly double bond
  3.    Hydrogen bond
  4.    Van der waals force
 Discuss Question
Answer: Option A. -> partial double bond
Question 55. . Which hemoglobin chain replaces the beta chain in embryonic hemoglobulin?
  1.    Delta
  2.    Epsilon
  3.    Gamma
  4.    Alfa
 Discuss Question
Answer: Option B. -> Epsilon
Question 56. . Hemoglobin has quaternary structure and is made up of
  1.    six polypeptide chains, two α-chains and four β-chains
  2.    two polypeptide chains, one α-chains and one β-chains
  3.    four polypeptide chains, two α-chains and two β-chains
  4.    five polypeptide chains, two α-chains and three β-chains
 Discuss Question
Answer: Option C. -> four polypeptide chains, two α-chains and two β-chains
Question 57. . When pO2 = Kd of myoglobin, the fractional saturation (YO2) is about
  1.    0.1
  2.    0.5
  3.    0.9
  4.    1.7
 Discuss Question
Answer: Option B. -> 0.5
Question 58. . Peptides in the fully extended chain conformation
  1.    have Y = F = 180°
  2.    do not occur in nature
  3.    also have a cis geometry in their peptide bonds
  4.    are equivalent to the (3-sheet structure
 Discuss Question
Answer: Option A. -> have Y = F = 180°
Question 59. . The oxygen in hemoglobin and myoglobin is bound to
  1.    the iron atom in the heme group
  2.    the nitrogen atoms on the heme
  3.    histidine residues in the protein
  4.    lysine residues in the protein
 Discuss Question
Answer: Option A. -> the iron atom in the heme group
Question 60. . Which of the three subunits of the G proteins binds GDP and GTP?
  1.    Alpha
  2.    Beta
  3.    Gamma
  4.    Delta
 Discuss Question
Answer: Option A. -> Alpha

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