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

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