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KVPY Sample Paper KVPY Stream-SX Model Paper-6

  • question_answer
    Identify the bacterium that appears violet after Gram staining.

    A) Salmonella enteric

    B) Escherichia coli

    C) Mycobacterium tuberculosis

    D) Rhizobium meliloti

    Correct Answer: C

    Solution :

    Mycobacterium tuberculosis is a Gram positive bacterium that appears violet after Gram staining. This is because it retains the colour crystal violet dye due to the presence of a thicker peptidoglycan layer.


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