What is the best theory of evolution of Eukaryotic cell?

The nucleus of the eukaryotic cell is comparable in size, shape and composition to the complete body of a prokaryote. According to one theory, it's wrong to think in terms of a prokaryote cell growing into a eukaryote-sized cell and meanwhile adding in a nucleus surrounded by an internal membrane. read more

The nucleus of the eukaryotic cell is comparable in size, shape and composition to the complete body of a prokaryote. According to one theory, it's wrong to think in terms of a prokaryote cell growing into a eukaryote-sized cell and meanwhile adding in a nucleus surrounded by an internal membrane. read more

The Evolution of Eukaryotic Cells Getty/Stocktrek Images As life on Earth started to undergo evolution and become more complex, the simpler type of cell called a prokaryote underwent several changes over a long period of time to become eukaryotic cells. read more

The endosymbiotic theory describes how a large host cell and ingested bacteria could easily become dependent on one another for survival, resulting in a permanent relationship. Over millions of years of evolution, mitochondria and chloroplasts have become more specialized and today they cannot live outside the cell. read more