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MCQs

Total Questions : 47 | Page 3 of 5 pages
Question 21. Which of the following factor has a negative impact on substrate collision theory?
  1.    Temperature
  2.    Protonation or Deprotonation
  3.    Substrate concentration
  4.    Type of medium
 Discuss Question
Answer: Option B. -> Protonation or Deprotonation
Answer: (b).Protonation or Deprotonation
Question 22. The transition state cannot be achieved by using one of the following methods?
  1.    Substrate collision theory
  2.    Lock and key model
  3.    Acid-base catalysis
  4.    Covalent catalysis
 Discuss Question
Answer: Option B. -> Lock and key model
Answer: (b).Lock and key model
Question 23. In the catalysis of RNA by Bovine pancreatic RNase A, His 12 acts as proton donor.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option B. -> False
Answer: (b).False
Question 24. The phenomenon which involves formation of an additional covalent intermediate in a reaction that helps to reduce the energy of later transition states is referred to as ___________
  1.    covalent catalysis
  2.    substrate collision theory
  3.    general acid-base catalysis
  4.    specific acid-base catalysis
 Discuss Question
Answer: Option D. -> specific acid-base catalysis
Answer: (d).specific acid-base catalysis
Question 25. _____________ involves donation of electrons from nucleophilic active site residues to a substrate forming a covalent adduct transition state intermediate.
  1.    General acid-base catalysis
  2.    Specific acid-base catalysis
  3.    Electrophilic catalysis
  4.    Nucleophilic catalysis
 Discuss Question
Answer: Option D. -> Nucleophilic catalysis
Answer: (d).Nucleophilic catalysis
Question 26. Chymotrypsin: Nucleophilic catalysis:: Carboxypeptidase A: __________
  1.    General acid-base catalysis
  2.    Specific acid-base catalysis
  3.    Electrophilic catalysis
  4.    Nucleophilic catalysis
 Discuss Question
Answer: Option C. -> Electrophilic catalysis
Answer: (c).Electrophilic catalysis
Question 27. A type of catalysis which involves covalent intermediate transition state formation between the cationic electrophilic group in the enzyme and the electron rich portion of the substrate is referred to as ____________
  1.    general acid-base catalysis
  2.    electrophilic catalysis
  3.    nucleophilic catalysis
  4.    specific acid-base catalysis
 Discuss Question
Answer: Option B. -> electrophilic catalysis
Answer: (b).electrophilic catalysis
Question 28. Which of these is not required for electrophilic catalysis?
  1.    Mg²⁺
  2.    Zn²⁺
  3.    Mn²⁺
  4.    Ser 195
 Discuss Question
Answer: Option A. -> Mg²⁺
Answer: (a).Mg²⁺
Question 29. Which of these is referred to as Kcat?
  1.    Miachelis Menten constant
  2.    Catalytic efficiency
  3.    Substrate concentration
  4.    Turn over number
 Discuss Question
Answer: Option D. -> Turn over number
Answer: (d).Turn over number
Question 30. What does the following equation represent?
\(\frac{1}{V_0} = \frac{K_m}{V_{max}} \frac{1}{[S]}+\frac{1}{V_{max}}\)
  1.    Eadie-Hofstee plot equation
  2.    Lineweaver Burk equation
  3.    Miachelis Menten equation
  4.    Hanes plot equation
 Discuss Question
Answer: Option B. -> Lineweaver Burk equation
Answer: (b).Lineweaver Burk equation

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