|Bacteria cells have four basic shapes:|
They can be found as single cells, in pairs, chains or clusters.
A bacterial cell has a wall which maintains its shape and protects it. Some bacteria can move. Usually they use flagella, which are like little corkscrews. These rotate from the base like a ship’s propeller. The flagella may be distributed randomly over the whole cell surface, in groups or singly.
Some bacteria have numerous fringe-like projections called fimbriae which enable them to stick to each other. Other bacteria produce a sticky substance around the cell wall. This provides protection and helps them to stick to substrates, as well as each other.