It is true that the cell walls of bacteria give them shapes and differentiate Gram-positive bacteria from Gram-negative ones.
Bacterial cell walls
The cell wall of bacteria functions mainly as a protective and permeable layer.
It gives bacteria their characteristic shapes and the component of each bacterium's cell wall determines whether it will be able to retain the color of a dye or otherwise.
Bacteria with thick peptidoglycan cells walls are able to retain the color of dyes with their cells walls and are said to be Gram-positive.
Those whose cell wall is light are not able to retain the color of Gram's dye and are said to be Gram-negative.
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