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  • Question
  • During which phase of growth of Penicillium chrysogenum maximum antibiotic production takes place


  • Options
  • A. during the first phase
  • B. during the second phase
  • C. during the third phase
  • D. same in all the phases

  • Correct Answer
  • during the second phase 


  • Antibiotics problems


    Search Results


    • 1. Chlorotetracyclin is soluble in

    • Options
    • A. organic solvents
    • B. water
    • C. ether
    • D. all of these
    • Discuss
    • 2. The yield of the antibiotic depends upon

    • Options
    • A. pH of the medium
    • B. age of the inoculum
    • C. composition of the medium
    • D. all of these
    • Discuss
    • 3. Media composition for the production of streptomycin is

    • Options
    • A. soybean meal, glucose, peptone, malt extract, sodium chloride
    • B. soybean meal, glucose, peptone, malt extract, ammonium chloride
    • C. soybean meal, glucose, peptone, malt extract, calcium carbonate
    • D. soybean meal, glucose, peptone, malt extract, ammonium sulphate
    • Discuss
    • 4. Antibiotics are typically produced in fed batch reactors because

    • Options
    • A. antibiotic yields are generally higher when cells enter the stationary phase
    • B. the precursors are often toxic to the cells
    • C. antibiotic yields are generally higher when cell growth slows
    • D. All of the above
    • Discuss
    • 5. Which of the following precursor is added in the medium to get penicillin G?

    • Options
    • A. Phenyl carbamic acid
    • B. Phenyl acetic acid
    • C. Ammonium sulphate
    • D. Ammonium chloride
    • Discuss
    • 6. pH of the fermentation medium for chlorotetracyclins is

    • Options
    • A. 5-6
    • B. 6-7
    • C. 7-8
    • D. 8-9
    • Discuss
    • 7. Media used for the production of chlorotetracyclin consists of

    • Options
    • A. sugar, corn steep liquor, CaCO3, (NH4)2SO4 and NH4 Cl
    • B. corn steep liquor, CaCO3 and (NH4)2SO4
    • C. sugar, CaCO3 and (NH4)2SO4
    • D. corn steep liquor, CaCO3, (NH4)2SO4 and NH4 Cl
    • Discuss
    • 8. Penicillin is produced by

    • Options
    • A. aerobic fermentation
    • B. anaerobic fermentation
    • C. aerobic fermentation followed by anaerobic fermentation
    • D. anaerobic fermentation followed by aerobic fermentation
    • Discuss
    • 9. Penicillin is recovered after fermentation as

    • Options
    • A. potassium penicillin
    • B. calcium penicillin
    • C. sodium penicillin
    • D. penicillin only
    • Discuss
    • 10. Streptomycin is produced by

    • Options
    • A. S. griseus
    • B. S. griseoflavus
    • C. S. aerofaciens
    • D. S. ramosus
    • Discuss


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