Assoc. Prof. Zdravka Kostova, DSc.
Sofia University „St. Kliment Ohridski“
Abstract. The article discusses successive stages in the evolution of life up to the establishment of the prokaryotic cell emphasizing the transitions from pre-biotic environment to organic precursors, pre-RNA-RNA, RNA-proteins-DNA, DNA-LUCA. They are paired with the development of pre-biotic structural progenitors of a cell - micelles, vesicles, protocells, prokaryotic ancestor, two prokaryotic branches – Eubacteria and Archaebacteria. The driving force is the natural selection (chemical, biochemical and biological), maintaining the correspondence between the emerging structures and their environment
Keywords: pre-biotic environment; polymerization; evolutionary transitions; bioenergetic processes; redox potential