Bacteria Cell Walls Shaped Diff Gram Red Gram Positive

bacteria (clssified in 2 ways;basic shape (may be rod shaped, spherical,comma shaped, spiralled or corkscrew), or by cell walls (2 main types have diff structure and react diff during gram satining, gram positive bacteria look purple/blue under microscope, and negative appears red), useful as type of cell wall affects how bacteria reacts to antibiotics)

crystal violet applied with iodine (fixes dye) onto specimen and washed with alcohol, gram-positive retains stain (so blue/purple), gram-negative have thinner cell walls so lose stain, (so stained with a counterstain, safranin dye, and appear red), gram-positive susceptible to antibiotics as they inhibit formation of cell walls