The Ultrastructure Of A Typical Bacterial Cell

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The Ultrastructure Of A Typical Bacterial Cell

• By Luke Jones

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The Bacterial Cell

• This is a diagram of a typical bacterial cell,
  displaying all of its organelle.

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The Bacterial Cell

• This is what a bacterial cell looks like under an
  electron microscope.

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Next- The Organelle and their functions

• P.T.O

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Bacterial Cell Wall

• Made from the Glycoprotein murein.
• Its purpose is to provide the cell with strength
  and rigidity.
• It is permeable to solutes.

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Cell Membrane

• This is made from phospholipids, proteins and
  carbohydrates, forming a fluid-mosaic.
• It surrounds the bacteria and is its most
  important organelle.
• It is controls the movement of substances in and
  out of the cell.

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Genetic material

• The prokaryotic Bacterial cell has no nucleus.
• Its genetic material and D.NA are contained in a
  nucleoid.

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Ribosomes

• These are the smallest and most numerous of cell
  organelle.
• Their purpose is protein synthesis for the cells
  own use.
• They consist of protein and RNA.
• They are located either free in the cytoplasm of
  attached to the RER.

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Flagellum

• This is a rigid rotating tail.
• Its purpose is to propel the cell.
• Clockwise rotation is what propels the cell
  forward, anticlockwise rotation causes a chaotic
  spin.
• The rotation is powered by a H gradient across
  the cell membrane.

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Plasmid

• A plasmid is a small circle of DNA.
• Bacterial cells have a number of plasmids.
• Plasmids are used to exchange DNA between
  bacterial cells.

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Capsule

• This is a kind of slime layer covering the
  outside of the cell wall.
• It is composed of a thick polysaccharide.
• It is used to stick cells together and as a food
  reserve.
• It is also there to protect the cell from
  desiccation, and from chemicals.

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GOOD BYE!

• The excitement must have reached fever-pitch!