Gram Positive Bacteria | Gram Negative Bacteria |
Have multilayered cell walls. | Have single layered walls. |
Stain a purple color in a crystal violet dye. | Will not react to crystal violet dye but only to a counter stain thus giving away a pinkish colored stain. |
Penicillin resistant. | Respond well to penicillin treatment. |
Persist in dry environments better and are often found on places like the skin and in dust. | Killed more quickly by drying but thrive in aqueous environments. |
Bacteria are classified because of their characteristic staining properties under the microscope, during Grams method of staining.