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Question

Is E. Coli a Gram-positive or Gram-negative bacteria?


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Solution

Gram-positive:

  1. These bacteria have a purple color after performing gram staining.
  2. Teichoic acids are present in these bacteria.
  3. There is no outer lipid membrane.
  4. An example is Bacillus anthracis.

Gram-negative:

  1. After gram staining, they pick up the reddish color of the counterstain.
  2. Teichoic acids are not present.
  3. There is an outer lipid membrane present.
  4. Examples include Salmonella, E. coli, etc.

E. Coli is a Gram-negative bacteria and not a Gram-positive bacteria.


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