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MCQs

Total Questions : 105 | Page 4 of 11 pages
Question 31. For an enzyme that displays Michaelis-Menten kinetics, the reaction velocity (as a fraction of Vmax) observed at [S] = 2 KM will be
  1.    0.09
  2.    0.33
  3.    0.66
  4.    0.91
 Discuss Question
Answer: Option C. -> 0.66
Answer: (c).0.66
Question 32. Predominantly uncompetitive inhibition may be called when
  1.    competitive inhibition is greater than uncompetitive inhibition
  2.    competitive inhibition is smaller than uncompetitive inhibition
  3.    competitive inhibition is equal to uncompetitive inhibition
  4.    none of the above
 Discuss Question
Answer: Option A. -> competitive inhibition is greater than uncompetitive inhibition
Answer: (a).competitive inhibition is greater than uncompetitive inhibition
Question 33. Which of the following statement(s) regarding enzymes, is/are false?
  1.    Enzymes are always proteins that function as catalysts
  2.    Enzymes provide activation energy for reactions
  3.    Enzyme activity can be regulated
  4.    Enzymes may be used many times for a specific reaction
 Discuss Question
Answer: Option B. -> Enzymes provide activation energy for reactions
Answer: (b).Enzymes provide activation energy for reactions
Question 34. The rate equation in non-competitive inhibition based on Michaelis Menten equation is given by
  1.    rmaxS/(Km + S)(1+I/Ki)
  2.    rmaxE/(Km (1+I/Ki)+S))
  3.    VmaxS/(Km + S)(1+I/Ki)
  4.    rmaxS/Km
 Discuss Question
Answer: Option A. -> rmaxS/(Km + S)(1+I/Ki)
Answer: (a).rmaxS/(Km + S)(1+I/Ki)
Question 35. An enzyme has a Km of 4.7 x 10¯⁵M. If the Vmax of the preparation is 22m moles liter­¹ min­¹, what velocity would be observed in the presence of 2.0 x 10¯⁴M substrate and 5.0 x 10¯⁵M of a competitive inhibitor?
  1.    13.54μ moles liter­¹min­¹
  2.    6.68μ moles liter­¹min­¹
  3.    7.57μ moles liter­¹min­¹
  4.    17.8μ moles liter­¹min­¹
 Discuss Question
Answer: Option A. -> 13.54μ moles liter­¹min­¹
Answer: (a).13.54μ moles liter­¹min­¹
Question 36. If a solution on addition of small amounts of acids or bases doesn't change significantly and maintains its ph, this type of solution is called a/an
  1.    saturated solution
  2.    unsaturated solution
  3.    buffer solution
  4.    super saturated solution
 Discuss Question
Answer: Option C. -> buffer solution
Answer: (c).buffer solution
Question 37. An aqueous mixture of sodium ethanoate is a buffer solution in
  1.    ethanoic acid
  2.    ethanol
  3.    ethene
  4.    ethanal
 Discuss Question
Answer: Option A. -> ethanoic acid
Answer: (a).ethanoic acid
Question 38. Carbon dioxide in rainwater form dilute solution of a weak acid
  1.    carbonic acid
  2.    carboxylic acid
  3.    carbonyl acid
  4.    carbonic acid
 Discuss Question
Answer: Option D. -> carbonic acid
Answer: (d).carbonic acid
Question 39. CH₃COOH is a weak acid and unionized form of
  1.    ethanoic acid
  2.    ethanol
  3.    ethene
  4.    ethanal
 Discuss Question
Answer: Option A. -> ethanoic acid
Answer: (a).ethanoic acid
Question 40. Excessive addition of acid or alkalis cannot be handled by
  1.    saturated solution
  2.    unsaturated solution
  3.    buffer solution
  4.    super saturated solution
 Discuss Question
Answer: Option C. -> buffer solution
Answer: (c).buffer solution

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