NEET BIOLOGY

Detailed explanation-1: -If the bacteria was colored purple, it means you likely have a Gram-positive infection. If the bacteria was colored pink or red, it means you likely have a Gram-negative infection.

Detailed explanation-2: -gram stain test Gram-positive bacteria remain purple because they have a single thick cell wall that is not easily penetrated by the solvent; gram-negative bacteria, however, are decolorized because they have cell walls with much thinner layers that allow removal of the dye by the solvent.

Detailed explanation-3: -Gram positive bacteria have a distinctive purple appearance when observed under a light microscope following Gram staining. This is due to retention of the purple crystal violet stain in the thick peptidoglycan layer of the cell wall.

Detailed explanation-4: -The staining procedure differentiates organisms of the domain Bacteria according to cell wall structure. Gram-positive cells have a thick peptidoglycan layer and stain blue to purple. Gram-negative cells have a thin peptidoglycan layer and stain red to pink.