Bacteria Morphology
Periplasm is

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

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Bacteria Morphology
Flagella move the cell by

spinning like a propeller
attaching to nearby particles and contracting
many flagella beating in a synchronous, whip-like motion
an individual flagellum beating in a whip-like motion

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