Bacteria Morphology
Gram positive cells have a

second outer membrane that helps to retain the crystal violet stain
multiple layer of peptidoglycan that helps to retain the crystal violet stain
thick capsule that traps the crystal violet stain
periplasmic space that traps the crystal violet

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Bacteria Morphology
The cell wall of

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

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Bacteria Morphology
Porins are located in

the peptidoglycan layer of gram-positive bacteria
the periplasmic space of gram-negative bacteria
the outer membrane of gram-negative bacteria
the cytoplasmic membrane of both gram-negative and gram-positive bacteria

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