Question

which type of bacteria stain purple during gram - staining? gram - negative bacteria gram - positive bacteria

Explanation:

Gram - positive bacteria have a thick peptidoglycan layer in their cell wall which retains the crystal violet - iodine complex during Gram - staining, causing them to stain purple. Gram - negative bacteria have a thin peptidoglycan layer and an outer membrane, and they lose the crystal violet - iodine complex during the decolorization step and stain pink or red with the counter - stain.

Answer:

Gram - positive bacteria