Bacteria Morphology
Porins are located in

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

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Bacteria Morphology
Flagella move the cell by

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

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