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MCQs

Total Questions : 118 | Page 8 of 12 pages
Question 71. ___________ is also the major reason for enzyme inactivation by microbial contamination.
  1.    Proteolysis
  2.    Heat
  3.    Loss of co-factors or co-enzymes
  4.    Oxidation
 Discuss Question
Answer: Option A. -> Proteolysis
Answer: (a).Proteolysis
Question 72. Which of the following causes of enzyme inactivation?
  1.    Filtration
  2.    Loss of cofactor or coenzymes
  3.    Centrifugation
  4.    Crossflow microfiltration
 Discuss Question
Answer: Option B. -> Loss of cofactor or coenzymes
Answer: (b).Loss of cofactor or coenzymes
Question 73. Which of the following approach is not a key to maintaining enzyme activity?
  1.    Use of additives
  2.    Controlled used of covalent modification
  3.    Accurate, precise, reproducible, linear and free from electrical noise
  4.    Enzyme immobilization
 Discuss Question
Answer: Option C. -> Accurate, precise, reproducible, linear and free from electrical noise
Answer: (c).Accurate, precise, reproducible, linear and free from electrical noise
Question 74. Which of these is of primary importance to the enzyme producer and customer?
  1.    pH
  2.    Temperature
  3.    Denaturation time
  4.    Activity
 Discuss Question
Answer: Option D. -> Activity
Answer: (d).Activity
Question 75. ____________ is an art and is a method used to stabilize enzyme preparations.
  1.    Chromatography
  2.    Centrifugation
  3.    Formulation
  4.    Filtration
 Discuss Question
Answer: Option C. -> Formulation
Answer: (c).Formulation
Question 76. Which of these is used for enzyme stabilization?
  1.    Potassium hydrogen phosphate
  2.    Sodium thiosulphate
  3.    Calcium chloride
  4.    EDTA
 Discuss Question
Answer: Option A. -> Potassium hydrogen phosphate
Answer: (a).Potassium hydrogen phosphate
Question 77. Pick the odd one out.
  1.    Glycerol
  2.    Polyvinyl alcohol
  3.    Sorbitol
  4.    Mannitol
 Discuss Question
Answer: Option B. -> Polyvinyl alcohol
Answer: (b).Polyvinyl alcohol
Question 78. Which of these is not a hydrophilic polymer used to stabilize enzymes?
  1.    Polyvinyl alcohol
  2.    Polyvinylpyrrolidone
  3.    Mannitol
  4.    Hydroxypropylcelluloses
 Discuss Question
Answer: Option C. -> Mannitol
Answer: (c).Mannitol
Question 79. Which of the following is not added as a preservative for liquid enzyme preparation?
  1.    Antibiotic
  2.    Benzoic acid esters
  3.    Thiols
  4.    Carboxymethylcellulose
 Discuss Question
Answer: Option D. -> Carboxymethylcellulose
Answer: (d).Carboxymethylcellulose
Question 80. Which of these is not added as a preservative for solid enzyme preparation?
  1.    Thiols
  2.    Starch
  3.    Lactose
  4.    Carboxymethylcellulose
 Discuss Question
Answer: Option A. -> Thiols
Answer: (a).Thiols

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