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MCQs

Total Questions : 105 | Page 3 of 11 pages
Question 21. An enzyme and a reactant molecule maintain relationship as
  1.    a temporary association
  2.    an association stabilized by a covalent bond
  3.    one in which the enzyme is changed permanently
  4.    non complementary binding
 Discuss Question
Answer: Option A. -> a temporary association
Answer: (a).a temporary association
Question 22. An enzyme is assayed at an initial substrate concentration of 2 x 10¯⁵M. In 6 minute, half of the substrate is used. The Km for the substrate is 2 x 10¯³M. The value of k in minute is
  1.    0.115
  2.    0.42
  3.    0.093
  4.    6.693
 Discuss Question
Answer: Option A. -> 0.115
Answer: (a).0.115
Question 23. Which of these enzymes contains a Zinc (Zn) ion?
  1.    Carboxypeptidase A
  2.    Phosphorylase B kinase
  3.    Tyrosine hydroxylase
  4.    Phosphodiesterase
 Discuss Question
Answer: Option A. -> Carboxypeptidase A
Answer: (a).Carboxypeptidase A
Question 24. The plot commonly used for determining the value of Vmax is
  1.    Lineweaver Burk plot
  2.    Langmuir plot
  3.    Eadie Hofstee plot
  4.    all of these
 Discuss Question
Answer: Option D. -> all of these
Answer: (d).all of these
Question 25. Quasi steady state is also known as
  1.    Michaelis Menten approach
  2.    Briggs-Haldane approach
  3.    Pseudo steady state
  4.    all of the above
 Discuss Question
Answer: Option C. -> Pseudo steady state
Answer: (c).Pseudo steady state
Question 26. The ratio of the amount of a protein present in a sample, which is used as a measure of purification, is known as
  1.    specific activity
  2.    relative activity
  3.    purity ratio
  4.    all of these
 Discuss Question
Answer: Option A. -> specific activity
Answer: (a).specific activity
Question 27. If a reaction occurs in the absence of inhibitor with rate ν0 and in the presence of inhibitor with rate νi, the degree of inhibition is defined as
  1.    (ν0 - νi)/ν0
  2.    (ν0 + νi)/ν0
  3.    (ν0νi)/ν0
  4.    (ν0-νi)/νi
 Discuss Question
Answer: Option A. -> (ν0 - νi)/ν0
Answer: (a).(ν0 - νi)/ν0
Question 28. The rate equation in competitive inhibition based on Michaelis Menten equation is given by
  1.    rmaxS/(Km (1+I/Ki)+S))
  2.    rmaxE/(Km (1+I/Ki)+S))
  3.    rmaxI/(Km (1+I/Ki)+S))
  4.    rmaxS/(Km (1+I/Ki))
 Discuss Question
Answer: Option A. -> rmaxS/(Km (1+I/Ki)+S))
Answer: (a).rmaxS/(Km (1+I/Ki)+S))
Question 29. In the steady state the material balance equation for any component of a system is
  1.    rate of addition + rate of removal - rate of formation = 0
  2.    rate of addition - rate of removal + rate of formation = 0
  3.    rate of addition + rate of removal + rate of formation = 0
  4.    none of the above
 Discuss Question
Answer: Option B. -> rate of addition - rate of removal + rate of formation = 0
Answer: (b).rate of addition - rate of removal + rate of formation = 0
Question 30. Classical noncompetitive inhibition is obtained only under
  1.    slow equilibrium conditions
  2.    moderate equilibrium conditions
  3.    rapid equilibrium conditions
  4.    non-equilibrium conditions
 Discuss Question
Answer: Option C. -> rapid equilibrium conditions
Answer: (c).rapid equilibrium conditions

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