Microbiologists from the University of California believe that life on earth in the form as it exists now, would not occur if the world did not appear the two ancient primitive single-celled organism, known as prokaryotes.
Now to the domains of prokaryotes are bacteria and archaea. The genetic material of prokaryotes represented by a single DNA molecule in a closed ring, there is only one replicon. In cells lacking organelles with the membrane structure.
Biologist James Lake of the Center for Astrophysics and Biology, University of California at Los Angeles compared the different types of proteins found in the body, and existing for today more than 3000 prokaryotic two previously unknown prokaryotes, appeared more than 2.5 billion years ago. Then it was very simple non-nuclear organisms, which are synthesized and made progress in organic development.
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