Bacteria Morphology
The cell walls of Gram positive bacteria contain two modified sugar, viz. N- acetylgucosamine (NAG) and N- acetylmuramic acid (NAM). They are covalently linked by

α- 1,6-glycosidic bond
β- 1,4-glycosidic bond
β-1,6-glycosidic bond
α- 1,4-glycosidic bond

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Bacteria Morphology
The cell wall of

gram-positive bacteria are thicker than gram-negative bacteria
gram-negative bacteria are thicker than gram-positive bacteria
none of these
both have same thickness but composition is different

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