Structure and cell wall composition of bacteria E. coli ( Gram-negative)

• The cell is surrounded by a plasma membrane.
• No sub-cellular organelles, only the infolding of plasma membrane called mesosomes.
• DNA is within cytosol to form nucleoids.
• 2µm long and less than 1 µm in diameter.
• Has a protective outer membrane and an inner plasma membrane.
• Between the membrane is a thin but stronger layer of peptidoglycan ( Peptidoglycan gives cell shape and rigidity).
• Plasma membranes contain proteins capable of transporting certain ions and compounds into the cell and transporting wastes out.
• Flagella helps in the movement of the bacteria.
• DNA is 1000 times longer than the cell.
• The mesosome is the site of DNA replication.
• Mesosomes contain protein and pigment to trap light and generate ATP.