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MCQs

Total Questions : 193 | Page 11 of 20 pages
Question 101. The molecule which acts directly on an enzyme to lower its catalytic rate is __________
  1.    Repressor
  2.    Inhibitor
  3.    Modulator
  4.    Regulator
 Discuss Question
Answer: Option B. -> Inhibitor
Answer: (b).Inhibitor
Question 102. Which of the following is an example for irreversible inhibitor?
  1.    Disulfiram
  2.    Oseltamivir
  3.    Protease inhibitors
  4.    DIPF
 Discuss Question
Answer: Option D. -> DIPF
Answer: (d).DIPF
Question 103. Where does inhibitor binds on enzyme in mixed inhibition?
  1.    At active site
  2.    Allosteric site
  3.    Does not bind on enzyme
  4.    Binds on substrate
 Discuss Question
Answer: Option B. -> Allosteric site
Answer: (b).Allosteric site
Question 104. Which of the following is an example of reversible inhibitor?
  1.    DIPF
  2.    Penicillin
  3.    Iodoacetamide
  4.    Protease inhibitors
 Discuss Question
Answer: Option D. -> Protease inhibitors
Answer: (d).Protease inhibitors
Question 105. The catalytic efficiency of two distinct enzymes can be compared based on which of the following factor?
  1.    Kₘ
  2.    Product formation
  3.    Size of the enzymes
  4.    pH of optimum value
 Discuss Question
Answer: Option A. -> Kₘ
Answer: (a).Kₘ
Question 106. Which of the following is false about lysozyme?
  1.    It is an antibacterial agent found in tears and egg white
  2.    The substrate of lysozyme is peptidoglycan
  3.    Lysozyme cleaves (β1 → 4) glycosidic C-O bonds between two types of sugar residue in the molecule NAM and NAG
  4.    It is a bisubstrate enzyme
 Discuss Question
Answer: Option D. -> It is a bisubstrate enzyme
Answer: (d).It is a bisubstrate enzyme
Question 107. Which of the following is false?
  1.    Methyl, phosphoryl, adenyl, uridylyl and adenosine diphosphate ribosyl groups are the modifying groups
  2.    An example of an enzyme regulated by methylation is the methyl-donating chemo taxis protein of bacteria
  3.    The protein is a part of the system that permits a bacterium to swim towards attractant
  4.    The methylating agent is S- adenosylmethionine
 Discuss Question
Answer: Option B. -> An example of an enzyme regulated by methylation is the methyl-donating chemo taxis protein of bacteria
Answer: (b).An example of an enzyme regulated by methylation is the methyl-donating chemo taxis protein of bacteria
Question 108. Which of the following is false about allosteric feedback inhibition?
  1.    Bacterial enzyme system is the first known example
  2.    Conversion of L-leucine to L-isoleucine
  3.    Threonine dehydratase is inhibited by isoleucine
  4.    If the isoleucine concentration decreases, the rate of threonine dehydration increases
 Discuss Question
Answer: Option B. -> Conversion of L-leucine to L-isoleucine
Answer: (b).Conversion of L-leucine to L-isoleucine
Question 109. The allosteric inhibitor of an enzyme ___________
  1.    Causes the enzyme to work faster
  2.    Binds to the active site
  3.    Participates in feedback regulation
  4.    Denatures the enzyme
 Discuss Question
Answer: Option C. -> Participates in feedback regulation
Answer: (c).Participates in feedback regulation
Question 110. Which of the following enzyme is responsible for the regulation of biological nitrogen fixation?
  1.    Dinitrogenase reductase
  2.    Dinitrogenase oxidase
  3.    Phosphatase
  4.    Kinase
 Discuss Question
Answer: Option A. -> Dinitrogenase reductase
Answer: (a).Dinitrogenase reductase

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