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There are three main shapes of bacteria: bacillus, coccus, and spiral. Bacillus, or rod shaped bacteria, are one of the main forms, and are typically 0.5 micrometers to 1.0 micrometer in width, and from 1.0 micrometer to 4.0 micrometers in length. Examples of bacilli include Bacillus anthracis, the bacterium that causes anthrax, and the well known E. coli.
They have no true nucleus as the DNA is not contained within a membrane or separated from the rest of the cell, but is coiled up in a region of the cytoplasm called the nucleoid. Prokaryotic organisms have varying cell shapes. The most common bacteria shapes are spherical, rod-shaped, and spiral.