Bacteria Morphology
Gram positive cells have a

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

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Bacteria Morphology
Periplasm is

the area between the inner and outer membranes of Gram-positive bacteria
the area outside the cell membrane that is influenced by the polymers
the interior portion of mitochondria
the area between the inner and outer membranes of gram-negative bacteria

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