Test of the parts of a Prokaryote cell using E.coli.

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E.coli bacterium
A typical E. coli bacterium is 3 microns long, but its DNA is more than 300 times longer. So, the DNA is tightly coiled and twisted to fit inside.

The E. coli cell is 1-5 µm in length.
An amazing degree of packing is necessary to fit the chromosome inside its tiny host.
The nucleoid occupies about half of the bacterial cytoplasm.

Electron micrograph of the nucleoid

The nucleoid as seen in thin sections of growing E. coli. Panels A and B show the same section; in panel B the ribosome-free spaces were enhanced by coloring by hand. Panel C contains a similar cell, stained with antibodies which stick to DNA.

 

This final diagram shows a drawing and the electron micrograph which was used to make the drawing.
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