Cutaway illustration of the internal structure of a typical bacterial cell. The bacterial cell wall (orange & brown) overlies the cytoplasmic membrane (white). Hair- like flagella cover the surface of the cell wall; their whip-like action enables the bacterium to move through its environment. Inside the cytoplasm, the nucleus is represented by the red coiled mass at left. Ribosomes (blue) are involved in the assembly of proteins. The formation of a cytoplasmic inclusion body is shown at top.