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MCQs

Total Questions : 68 | Page 3 of 7 pages
Question 21. Peptides in the fully extended chain conformation
  1.    do not occur in nature
  2.    have Y = F = 180°
  3.    are equivalent to the (3-sheet structure
  4.    also have a cis geometry in their peptide bonds
 Discuss Question
Answer: Option B. -> have Y = F = 180°
Question 22. Which hemoglobin chain replaces the beta chain in embryonic hemoglobulin?
  1.    Alfa
  2.    Delta
  3.    Epsilon
  4.    Gamma
 Discuss Question
Answer: Option C. -> Epsilon
Question 23. The nature of peptide bond can be best explained as
  1.    partial double bond
  2.    Van der waals force
  3.    truly double bond
  4.    Hydrogen bond
 Discuss Question
Answer: Option A. -> partial double bond
Question 24. Hemoglobin has quaternary structure and is made up of
  1.    two polypeptide chains, one α-chains and one β-chains
  2.    six polypeptide chains, two α-chains and four 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 25. When pO2 = Kd of myoglobin, the fractional saturation (YO2) is about
  1.    0.1
  2.    1.7
  3.    0.5
  4.    0.9
 Discuss Question
Answer: Option C. -> 0.5
Question 26. The oxygen in hemoglobin and myoglobin is bound to
  1.    the nitrogen atoms on the heme
  2.    the iron atom in the heme group
  3.    lysine residues in the protein
  4.    histidine residues in the protein
 Discuss Question
Answer: Option B. -> the iron atom in the heme group
Question 27. The different orders of protein structure are determined by all of the following bond types except
  1.    disulfide bridges
  2.    hydrogen bonds
  3.    phospho-diester bonds
  4.    peptide bonds
 Discuss Question
Answer: Option C. -> phospho-diester bonds
Question 28. If the F and Y angles of each peptide unit in a protein are known, which of the following may also be determined?
  1.    Complete tertiary structure
  2.    Complete quaternary structure
  3.    Thermodynamic stability
  4.    Complete secondary structure
 Discuss Question
Answer: Option D. -> Complete secondary structure
Question 29. Which of the three subunits of the G proteins binds GDP and GTP?
  1.    Delta
  2.    Gamma
  3.    Beta
  4.    Alpha
 Discuss Question
Answer: Option D. -> Alpha
Question 30. The heme is held in place by a bond between
  1.    the Fe3+ and cysteine
  2.    the Fe3+ and histidine
  3.    the Fe2+ and cysteine
  4.    the Fe2+ and histidine
 Discuss Question
Answer: Option D. -> the Fe2+ and histidine

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