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MCQs

Total Questions : 68 | Page 5 of 7 pages
Question 41. . An oil drop with a polar coat is a metaphor referring to the three dimensional structure of
  1.    fibrous proteins
  2.    collagen
  3.    globular proteins
  4.    silk protein
 Discuss Question
Answer: Option C. -> globular proteins
Question 42. . In β-pleated sheet structures neighbouring
  1.    chains lie in a flat plane
  2.    neighboring residues are hydrogen bonded
  3.    neighboring chains are connected by a-helices
  4.    neighboring chains are hydrogen bonded
 Discuss Question
Answer: Option D. -> neighboring chains are hydrogen bonded
Question 43. . The peptide bond in proteins is
  1.    planar, but rotates to three preferred dihedral angles
  2.    nonpolar, but rotates to three preferred dihedral angles
  3.    nonpolar, and fixed in a trans conformation
  4.    planar, and usually found in a trans conformation
 Discuss Question
Answer: Option D. -> planar, and usually found in a trans conformation
Question 44. . What was the first protein whose complete tertiary structure was determined?
  1.    Lysozyme
  2.    Myoglobin
  3.    Pancreatic ribonuclease
  4.    Pancreatic DNase
 Discuss Question
Answer: Option B. -> Myoglobin
Question 45. . The same peptide, Val-Lys-Glu-Met-Ser-Trp-Arg-Ala. was digested with chymotrypsin 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 B. -> Val-Lys-Glu-Met-Ser-Trp + Arg-Ala.
Question 46. . Disulfide bonds most often stabilize the native structure of
  1.    extracellular proteins
  2.    dimeric proteins
  3.    hydrophobic proteins
  4.    intracellular proteins
 Discuss Question
Answer: Option A. -> extracellular proteins
Question 47. . Secondary structure in protein refers to
  1.    linear sequence of amino acids joined together by peptide bond
  2.    three dimensional arrangement of all amino acids in polypeptide chain
  3.    regular folding of regions of the polypeptide chain
  4.    protein made up of more than one polypeptide chain
 Discuss Question
Answer: Option C. -> regular folding of regions of the polypeptide chain
Question 48. . Heme is the binding pocket of myoglobin and hemoglobin and is composed of
  1.    negatively charged residues
  2.    polar residues
  3.    hydrophobic residues
  4.    positively charged residues
 Discuss Question
Answer: Option C. -> hydrophobic residues
Question 49. . What is the proportion of glycine residues in collagenous regions?
  1.    One-fourth
  2.    One-third
  3.    Half
  4.    One-tenth
 Discuss Question
Answer: Option B. -> One-third
Question 50. . What is the effect of a decrease in pH on hemoglobin oxygen affinity?
  1.    Decrease in oxygen affinity
  2.    Increase in oxygen affinity
  3.    No effect on oxygen affinity
  4.    Increase affinity in muscle cell otherwise decrease
 Discuss Question
Answer: Option A. -> Decrease in oxygen affinity

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