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MCQs

Total Questions : 301 | Page 3 of 31 pages
Question 21. 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
Answer: (c).Val-Lys-Glu-Met + Ser-Trp-Arg-Ala
Question 22. 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
Answer: (a).extracellular proteins
Question 23. The heme is held in place by a bond between
  1.    the Fe²⁺ and cysteine
  2.    the Fe³⁺ and histidine
  3.    the Fe³⁺ and cysteine
  4.    the Fe²⁺ and histidine
 Discuss Question
Answer: Option D. -> the Fe²⁺ and histidine
Answer: (d).the Fe²⁺ and histidine
Question 24. 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 secondary structure
  2.    Complete tertiary structure
  3.    Complete quaternary structure
  4.    Thermodynamic stability
 Discuss Question
Answer: Option A. -> Complete secondary structure
Answer: (a).Complete secondary structure
Question 25. The different orders of protein structure are determined by all of the following bond types except
  1.    peptide bonds
  2.    phospho-diester bonds
  3.    disulfide bridges
  4.    hydrogen bonds
 Discuss Question
Answer: Option B. -> phospho-diester bonds
Answer: (b).phospho-diester bonds
Question 26. In a gel filtration column
  1.    smaller proteins enter the beads more readily
  2.    large proteins elute first
  3.    both (a) and (b)
  4.    large proteins enter the beads more readily
 Discuss Question
Answer: Option C. -> both (a) and (b)
Answer: (c).both (a) and (b)
Question 27. In a native PAGE, proteins are separated on the basis of
  1.    net negative charge
  2.    net charge and size
  3.    net positive charges size
  4.    net positive charge
 Discuss Question
Answer: Option B. -> net charge and size
Answer: (b).net charge and size
Question 28. Proteins are separated in an SDS-PAGE experiment on the basis of their
  1.    positively charged side chains
  2.    molecular weight
  3.    negatively charged side chains
  4.    different isoelectric points
 Discuss Question
Answer: Option B. -> molecular weight
Answer: (b).molecular weight
Question 29. An average polypeptide chain may contain up to
  1.    300 amino acids
  2.    400 amino acids
  3.    500 amino acids
  4.    more than 500 amino acids
 Discuss Question
Answer: Option C. -> 500 amino acids
Answer: (c).500 amino acids
Question 30. The subunit molecular weight as well as the number of subunits in the quaternary structure can be determined by
  1.    SDS-PAGE electrophoresis
  2.    gel filtration chromatography
  3.    combining information from (a)and (b)
  4.    isoelectric focusing
 Discuss Question
Answer: Option C. -> combining information from (a)and (b)
Answer: (c).combining information from (a)and (b)

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