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MCQs

Total Questions : 68 | Page 2 of 7 pages
Question 11. An oil drop with a polar coat is a metaphor referring to the three dimensional structure of
  1.    silk protein
  2.    fibrous proteins
  3.    globular proteins
  4.    collagen
 Discuss Question
Answer: Option C. -> globular proteins
Question 12. 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 13. 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 D. -> Val-Lys-Glu-Met-Ser-Trp + Arg-Ala.
Question 14. In β-pleated sheet structures neighbouring
  1.    chains lie in a flat plane
  2.    neighboring chains are connected by a-helices
  3.    neighboring residues are hydrogen bonded
  4.    neighboring chains are hydrogen bonded
 Discuss Question
Answer: Option D. -> neighboring chains are hydrogen bonded
Question 15. What was the first protein whose complete tertiary structure was determined?
  1.    Lysozyme
  2.    Pancreatic DNase
  3.    Myoglobin
  4.    Pancreatic ribonuclease
 Discuss Question
Answer: Option C. -> Myoglobin
Question 16. What is the effect of a decrease in pH on hemoglobin oxygen affinity?
  1.    Increase affinity in muscle cell otherwise decrease
  2.    Increase in oxygen affinity
  3.    Decrease in oxygen affinity
  4.    No effect on oxygen affinity
 Discuss Question
Answer: Option C. -> Decrease in oxygen affinity
Question 17. What is the proportion of glycine residues in collagenous regions?
  1.    One-fourth
  2.    One-tenth
  3.    Half
  4.    One-third
 Discuss Question
Answer: Option D. -> One-third
Question 18. Heme is the binding pocket of myoglobin and hemoglobin and is composed of
  1.    polar residues
  2.    negatively charged residues
  3.    positively charged residues
  4.    hydrophobic residues
 Discuss Question
Answer: Option D. -> hydrophobic residues
Question 19. Secondary structure in protein refers to
  1.    regular folding of regions of the polypeptide chain
  2.    linear sequence of amino acids joined together by peptide bond
  3.    protein made up of more than one polypeptide chain
  4.    three dimensional arrangement of all amino acids in polypeptide chain
 Discuss Question
Answer: Option A. -> regular folding of regions of the polypeptide chain
Question 20. The oxygen binding curves of hemoglobin and myoglobin
  1.    both (a) and (b)
  2.    are a consequence of the quaternary structure of hemoglobin
  3.    allow maximum transfer of oxygen to the tissues
  4.    are identical
 Discuss Question
Answer: Option A. -> both (a) and (b)

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