Answer / Anjula

Gram-positive bacteria retain the crystal violet dye after decolorization with alcohol or acetone, while gram-negative bacteria do not. Gram-positive bacteria have a thick peptidoglycan layer and no outer membrane, while gram-negatives have a thin peptidoglycan layer and an additional outer membrane. This difference in cell wall structure affects their staining properties, antibiotic susceptibility, and other biological characteristics.

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