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MCQs

Total Questions : 16 | Page 1 of 2 pages
Question 1. Enzyme-driven metabolic pathways can be made more efficient by
  1.    fixing enzymes into membranes so that they are adjacent to each other
  2.    All of these
  3.    concentrating enzymes within specific cellular compartments
  4.    grouping enzymes into free-floating, multienzyme complexes
 Discuss Question
Answer: Option B. -> All of these
Question 2. Tryprotophan synthetase of E.coli, a typical bifunctional oligomeric enzyme consist of
  1.    a protein designated A
  2.    a protein A and one-subunit a
  3.    a protein designated B
  4.    two proteins designated A and B
 Discuss Question
Answer: Option D. -> two proteins designated A and B
Question 3. What is the specificity of the Clostripain protease?
  1.    It cleave after His residues
  2.    None of these
  3.    It cleave after Lys residues
  4.    It cleave after Arg residues
 Discuss Question
Answer: Option D. -> It cleave after Arg residues
Question 4. Which of the following (s) is/are serine proteases?
  1.    all of these
  2.    Trypsin
  3.    Chymotrypsin
  4.    Elastase
 Discuss Question
Answer: Option A. -> all of these
Question 5. Which of the following statements about enzymes or their function is true?
  1.    Enzymes are proteins whose three-dimensional form is key to their function
  2.    Enzymes do not alter the overall change in free energy for a reaction
  3.    Enzymes speed up reactions by lowering activation energy
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these
Question 6. The role of Asp 102 and His 57 during trypsin catalysis is to
  1.    neutralize the charge on the other's side chain
  2.    clamp the substrate into the active site
  3.    keep the specificity pocket open
  4.    function as a proton shuttle
 Discuss Question
Answer: Option D. -> function as a proton shuttle
Question 7. Which of the following is false statement with regard to comparison between Serine and HIV proteases?
  1.    Both require water to complete the catalytic cycle
  2.    Both show specificity for certain amino acid sequences
  3.    Both forms an acyl-enzyme intermediate
  4.    Both use nucleophilic attack to hydrolyze the peptide bond
 Discuss Question
Answer: Option C. -> Both forms an acyl-enzyme intermediate
Question 8. In the enzyme-catalyzed reaction shown below, what will be the effect on substances A, B, C, and D of inactivating the enzyme labeled E2? A ---(E1)---> B ---(E2)---> C ---(E3)--->
  1.    A will still be produced, but not B, C, or D
  2.    A and B will still be produced, but not C or D
  3.    A, B, C, and D will all still be produced
  4.    A, B, and C will still be produced, but not D
 Discuss Question
Answer: Option B. -> A and B will still be produced, but not C or D
Question 9. The nucleophile in serine proteases is
  1.    water
  2.    Asparagine
  3.    both (a) and (b)
  4.    Serine
 Discuss Question
Answer: Option C. -> both (a) and (b)
Question 10. The proteolysis rate enhancement by chymotrypsin (~1010 folds) corresponds to a reduction in activation energy of about
  1.    40 kJ/mol
  2.    88 kJ/mol
  3.    49 kJ/mol
  4.    58 kJ/mol
 Discuss Question
Answer: Option D. -> 58 kJ/mol

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