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Six facts about prokaryotic cells

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  • Prokaryotic cells do not have a membrane-bound nucleus, their DNA is circular and naked.

  • Prokaryotic cells are very small (an average bacterial cell is around 8 micrometres long).

  • These cells may contain extra DNA in structures called plasmids.

There are 1 million micrometres in a metre. A polymer of beta glucose. Its long, straight molecules are held together with hydrogen bonds, producing tough cellulose fibres.