Gram +ve bacteria

Gram -ve bacteria

1. They remain coloured blue or purple with Gram stain even after washing with absolute alcohol or acetone.

2. The cell wall is 100-200A thick, single layered.

3.  The bacteria are less resistant to antibiotics.

4. They are mostly non-pathogenic.

1. They don't retain the stain when washed with absolute alcohol.

2. The cell wall is 70-120Å thick, two layered.

3.They are more resistant to antibiotics.

4. They are mostly pathogenic.