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Prokaryotic Cell Structure
On Your Own Annotate the diagram of a bacteria cell with
the function of each structure.
Indicate whether the structure is found in all
or some prokaryotic cells.
Cell Membrane
• Controls passage of materials into and out
of the cell
• All cells have a cell membrane
Nucleoid
• The glob of DNA in all prokaryotic cells
– Still a double helix
– Ends come together for form a circle
– Not wrapped around proteins as in eukaryotic cells (termed “naked DNA”).
Plasmid • A small circle of DNA found
in some prokaryotes that
exists and replicates
independently of the main
DNA in the nucleoid.
• Often contain genetic
instructions for resistance to
antibiotics (antibiotics are
chemicals that kill bacteria)
Some Prokaryotes have a cell wall
• Gives shape, support
and protection to the
plasma membrane and
cytoplasm of the cell.
• Eubacteria wall made of
peptidoglycan* (protein-
sugar molecules).
• *different than plant cell walls, which
are made of cellulose
Pili
• Short fibers projecting from the cell wall
found on some bacteria.
• They may help the bacteria cling to
surfaces.