Bacteria Morphology
Gram positive cells have a

periplasmic space that traps the crystal violet
thick capsule that traps the crystal violet stain
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
Porins are located in

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

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