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MCQs

Total Questions : 92 | Page 3 of 10 pages
Question 21. Antibiotics are typically produced in fed batch reactors because
  1.    antibiotic yields are generally higher when cells enter the stationary phase
  2.    the precursors are often toxic to the cells
  3.    antibiotic yields are generally higher when cell growth slows
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Answer: (d).All of the above
Question 22. Which of the following organism(s) produce(s) tetracycline?
  1.    Steptomyces aureofaciens
  2.    Steptomyces ramosus
  3.    Nocardia sulphurea
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these
Answer: (d).All of these
Question 23. Vegetable oil, (corn oil or soybean oil) added in the fermentation medium for penicillin, act as
  1.    source of nutrients
  2.    carbon source
  3.    antifoam agent
  4.    both (a) and (c)
 Discuss Question
Answer: Option C. -> antifoam agent
Answer: (c).antifoam agent
Question 24. Which of the following event occurs during third phase of growth of P chrysogenum?
  1.    Concentration of antibiotic increases in the medium
  2.    Autolysis of the medium starts
  3.    Slight rise in pH due to liberation of ammonia
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Answer: (d).All of the above
Question 25. Media used for the production of chlorotetracyclin consists of
  1.    sugar, corn steep liquor, CaCO3, (NH4)2SO4 and NH4 Cl
  2.    corn steep liquor, CaCO3 and (NH4)2SO4
  3.    sugar, CaCO3 and (NH4)2SO4
  4.    corn steep liquor, CaCO3, (NH4)2SO4 and NH4 Cl
 Discuss Question
Answer: Option A. -> sugar, corn steep liquor, CaCO3, (NH4)2SO4 and NH4 Cl
Answer: (a).sugar, corn steep liquor, CaCO3, (NH4)2SO4 and NH4 Cl
Question 26. Which of the following precursor is added in the medium to get penicillin G?
  1.    Phenyl carbamic acid
  2.    Phenyl acetic acid
  3.    Ammonium sulphate
  4.    Ammonium chloride
 Discuss Question
Answer: Option B. -> Phenyl acetic acid
Answer: (b).Phenyl acetic acid
Question 27. High yield of chlorotetracyclin requires
  1.    no aeration
  2.    continuous aeration
  3.    aeration which does not affect the yield
  4.    controlled aeration
 Discuss Question
Answer: Option B. -> continuous aeration
Answer: (b).continuous aeration
Question 28. Streptomycin is produced by
  1.    S. griseus
  2.    S. griseoflavus
  3.    S. aerofaciens
  4.    S. ramosus
 Discuss Question
Answer: Option A. -> S. griseus
Answer: (a).S. griseus
Question 29. The approach (s), which is/are currently followed to produce human monoclonal antibodies, is/are known as
  1.    transformation of antigen specific B lymphocytes (EBV)
  2.    hybridization of 6-thioguanine-resistant human plasmacytoma with immune human lymphocytes
  3.    combination of EB Vand hybridoma techniques
  4.    all of these
 Discuss Question
Answer: Option D. -> all of these
Answer: (d).all of these
Question 30. Some cross reactions with monoclonal antibodies (MAbs) can occur. Unexpected cross reactions occur more frequently with
  1.    Ig MAbs
  2.    IgG
  3.    IgA
  4.    IgE
 Discuss Question
Answer: Option A. -> Ig MAbs
Answer: (a).Ig MAbs

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