JIM DOWDALLS / SCIENCE PHOTO LIBRARY JIM DOWDALLS / SCIENCE PHOTO LIBRARY
This illustration depicts E-coli, a member of the family Enterobacteriaceae. The anatomy of an E. coli bacterium includes, from the inside out, the protoplasm (purple), which contains a single circular strand of DNA, and is the site for biochemical and synthetic activities; this inner core is surrounded by the cell membrane and another separate outer Gram-negative Cell wall.
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