what is the differences between gram positive and gram negative bacteria?
 Gram negative bacteria cannot be suppressed with penicillin unlike the gram positives because they are basically resistant to this type of antibiotic,  Gram positive bacteria have multilayered cell walls while gram negative bacteria have single layered walls and Gram positive bacteria stain a purple color in a crystal violet dye while gram negative bacteria will not react to this type of dye but only to a counterstain thus giving away a pinkish colored stain. 