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MCQs

Total Questions : 68 | Page 4 of 7 pages
Question 31.  Hydrogen bonds in a-helices are
  1.    more numerous than Vander Waals interactions
  2.    not present at Phe residues
  3.    analogous to the steps in a spiral staircase
  4.    roughly parallel to the helix axis
 Discuss Question
Answer: Option D. -> roughly parallel to the helix axis
Question 32.  The molecular formula for glycine is C2H5O2N. What would be the molecular formula for a linear oligomer made by linking ten glycine molecules together by condensation synthesis?
  1.    C20H50O20N10
  2.    C20H32O11N10
  3.    C20H40O10N10
  4.    C20H68O29N10
 Discuss Question
Answer: Option B. -> C20H32O11N10
Question 33.  The peptide bond in proteins is
  1.    only found between proline residues
  2.    usually cis unless proline is the next amino acid
  3.    usually trans unless proline is the next amino acid
  4.    is planar because of steric hinderance
 Discuss Question
Answer: Option C. -> usually trans unless proline is the next amino acid
Question 34.  In the β-pleated sheet
  1.    hydrogen bonds are formed between the peptide bonds
  2.    adjacent polypeptide chains can either be parallel or antiparallel
  3.    the polypeptide chain is fully extended
  4.    all of the above
 Discuss Question
Answer: Option D. -> all of the above
Question 35.  Which of the following is an example of tertiary structure in a protein?
  1.    A multimeric protein
  2.    An a-helix
  3.    A P-pleated sheet
  4.    A globular domain
 Discuss Question
Answer: Option D. -> A globular domain
Question 36.  In deoxy hemoglobin (Hb), the Fe (II) is coordinated to
  1.    four nitrogens of heme, the proximal His, and a water molecule
  2.    four nitrogens of heme and to a water molecule
  3.    two nitrogens of heme and to three His residues in Hb
  4.    two nitrogens of heme and to three water molecules
 Discuss Question
Answer: Option A. -> four nitrogens of heme, the proximal His, and a water molecule
Question 37.  The peptide, Val-Lys-Glu-Met-Ser-Trp-Arg-Ala, was digested with cyanogen bromide (CNBr) to produce:
  1.    Val-Lys + Glu-Met-Ser + Trp-Arg-Ala
  2.    Val-Lys-Glu-Met-Ser-Trp + Arg-Ala
  3.    Val-Lys-Glu-Met + Ser-Trp-Arg-Ala
  4.    Val-Lys-Glu + Met-Ser-Trp-Arg-Ala
 Discuss Question
Answer: Option C. -> Val-Lys-Glu-Met + Ser-Trp-Arg-Ala
Question 38.  The Ramachandran Plot illustrates the fact that
  1.    the peptide bond is planar
  2.    the F & Y angles can assume any value in a peptide
  3.    the F & Y angles can assume only a single value in a protein
  4.    the F & Y angles can assume approximately three different values
 Discuss Question
Answer: Option D. -> the F & Y angles can assume approximately three different values
Question 39. . The major element of secondary structure in myoglobin and hemoglobin is
  1.    the P-strand
  2.    the a-helix
  3.    the reverse turn
  4.    All of these
 Discuss Question
Answer: Option B. -> the a-helix
Question 40.  The resonance structures that can be drawn for the peptide bond indicate that the peptide bond
  1.    is stronger than an ordinary single bond
  2.    has partial double bond character
  3.    both (a) and (b)
  4.    is still not completely understood
 Discuss Question
Answer: Option C. -> both (a) and (b)

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