NEET Sample Paper NEET Sample Test Paper-15

  • question_answer The main difference in Gram-positive and Gram- negative bacteria resides in their

    A)  Cell wall                     

    B)  Cell membrane

    C)  Cytoplasm                 

    D)  Flagella

    Correct Answer: A

    Solution :

    Gram +ve and Gram -ve bacteria separates on the basis of their cell wall composition. Danish Bacteriologist Christian Gram on the basis of staining behavior of the cell wall with Gram's stain, grouped bacteria into Gram +ve and Gram -ve type. The bacteria which retain blue or purple colour after staining are Gram +ve, for e.g., Bacillus subtilis and the bacteria which loses blue colour is Gram -ve, for e.g., E.coli. In Gram -ve, the stain is washed due to high lipid content in the cell wall it has a thick wall, Gram +ve has single layered cell wall. Hence, the correct option is [a].

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