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Home Microbiology Industrially Useful Microbial Processes See What Others Are Saying!
  • Question
  • Which of the following organism is utilized to obtain commercial L-lysine by direct method?


  • Options
  • A. Micrococcus glutamicus
  • B. Mutated strain of Micrococcus glutamicus
  • C. Brevibacterium aminogenes
  • D. Mutated strain of Brevibacterium aminogenes

  • Correct Answer
  • Mutated strain of Micrococcus glutamicus 


  • More questions

    • 1. The viral DNA of the temperate phage, instead of taking over the functions of the cell's genes, is incorporated into the host DNA and becomes a prophage in the bacterial chromosome, acting as a gene. This happens in

    • Options
    • A. lysogeny
    • B. spontaneous induction
    • C. lytic phase
    • D. none of these
    • Discuss
    • 2. Black rots in eggs is most commonly caused by

    • Options
    • A. species of Proteus
    • B. species of Micrococcus or Bacillus
    • C. molds or yeasts
    • D. all of these
    • Discuss
    • 3. High acid foods with a pH < 3.7 undergo spoilage by

    • Options
    • A. Saccharolytic anaerobe
    • B. B. coagulans
    • C. both (a) and (b)
    • D. do not undergo spoilage by microorganisms
    • Discuss
    • 4. Organisms which have spore-forming stage in their life cycle and lack special locomotory organelles belong to which phylum of Protozoa?

    • Options
    • A. Microspora
    • B. Myxozoa
    • C. Ciliophora
    • D. Apicomplexa
    • Discuss
    • 5. Which of the following is used for the proper maintenance and preservation of pure cultures?

    • Options
    • A. Periodic transfer to fresh media
    • B. Preservation by overlaying cultures with mineral oil
    • C. Preservation by lyophilization
    • D. All of the above
    • Discuss
    • 6. Some cyanobacteria produce potent neurotoxins that, if ingested, will kill humans. These cyanobacteria are most likely to contaminate

    • Options
    • A. water rich in organic carbon wastes but poor in phosphate
    • B. water that are anoxic
    • C. water rich in phosphate wastes but poor in organic carbon
    • D. none of the above
    • Discuss
    • 7. Protease, which is used for flavouring of sake and haze removal in sake is produced by

    • Options
    • A. A. oryzae
    • B. A. flavus
    • C. B. cereus
    • D. A. niger
    • Discuss
    • 8. Main function of an enzyme is to

    • Options
    • A. increase the activation energy
    • B. decrease the activation energy
    • C. maintain constant activation energy
    • D. none of these
    • Discuss
    • 9. What is the order of reagents used in the Gram stain?

    • Options
    • A. Crystal violet, iodine, safranin, decolorizer
    • B. Crystal violet, iodine, decolorizer, safranin
    • C. Safranin, crystal violet, decolorizer, iodine
    • D. Crystal violet, safranin, iodine, decolorizer
    • Discuss
    • 10. Polymorphonuclear leukocytes (or PMNs)

    • Options
    • A. can be attracted to the site of an infection following activation of complement
    • B. are derived from bone marrow stem cells
    • C. are a type of phagocyte that can engulf and kill bacteria
    • D. all of the above
    • Discuss


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