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Home Microbiology Identification of Bacteria Comments

  • Question
  • Which of the following inference(s) indicate(s) the ability of an organism to utilize citrate as a sole source of carbon in Simmon's citrate medium?


  • Options
  • A. Blue colour
  • B. Appearance of growth
  • C. Both (a) and (b)
  • D. None of these

  • Correct Answer
  • Both (a) and (b) 


  • Identification of Bacteria problems


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    • 1. The deinococci are gram-positive cocci and rods that are distinctive in their unusually great resistance to

    • Options
    • A. radiation
    • B. desiccation
    • C. both (a) and (b)
    • D. extreme temperatures
    • Discuss
    • 2. Which of the following is a primary stain for acid fast staining of mycobacteria?

    • Options
    • A. Crystal violet
    • B. Carbol fuchsin
    • C. Geimsa
    • D. Methylene blue
    • Discuss
    • 3. Which of the following shows a positive urease test?

    • Options
    • A. Proteus
    • B. Klebsiella
    • C. Both (a) and (b)
    • D. None of these
    • Discuss
    • 4. Which of the following(s) is/ are oxidase-positive bacteria?

    • Options
    • A. Vibrio
    • B. Neisseria
    • C. Pseudomonas
    • D. All of these
    • Discuss
    • 5. The primary stain of Gram's method is

    • Options
    • A. safranin
    • B. phenolpthalene
    • C. crystal violet
    • D. methyl red
    • Discuss
    • 6. 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
    • 7. Which of the following is a substitute for crystal violet used in gram-staining procedure?

    • Options
    • A. Methylene blue
    • B. Bromocresol green
    • C. Safranin
    • D. Phenolpthalene
    • Discuss
    • 8. Production of acetoin can be detected by which of the following tests?

    • Options
    • A. Citrate test
    • B. Voges-Proskauer test
    • C. Methyl red test
    • D. Indole test
    • Discuss
    • 9. Gram staining was developed accidentally in 1884 by

    • Options
    • A. Alexander Fleming
    • B. Hans Christian Gram
    • C. Joseph Christian Gram
    • D. Robert Gram
    • Discuss
    • 10. What is the colour of gram -postive bacteria on a gram staining?

    • Options
    • A. Purple
    • B. Pink
    • C. Colourless
    • D. Green
    • Discuss


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