Which of the following is not characteristic of Gram-positive bacteria?

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According to Gram-staining, bacteria are divided into Gram-positive or Grma-negavtive bacteria. Gram-staing mostly differentiate the architecture of cell wall and gives a positive or negative result. The characteristic features of Gram-positive bacteria are

1. The cell wall is made up of single-layered (capsule)and smooth in nature.
2. Gram-positive bacteria possess flagella and the basal body rings supports it.
3. Mesosome (infolding of plasma membrane) is prominantly observed in the Gram-positive bacteria.

However, the Gram-positive bacteria lacks the outer membrane. Gram-negative bacteria contain an outer mebrane that contain lipopoly saccharides.