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Originally Posted by hannukah harry
maybe it's just me, but i'd call entering a cell and using it to reproduce itself reproduction. but now that i think about it a bit more, it isn't a good example because it does need the cell to reproduce. so if virii came before the cell, then they had to get the mechanism of reproduction from somewhere else and i'm really not sure where that could be. which would lead to the conclusion that cells came before the virus.
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The current theory is that free-floating RNA predated the cell, and eventually managed to end up inside of a phospholipid bilayer, and managed to replicate inside and have the bilayer split into multiple cells. In order for a cell to split, it would require centromeres (proteins that attach to polymer threads in the cell to make each DNA copy go to the daughter cells) on its genetic material, all sorts of structural proteins and polymers to facilitate division, and the capability to synthesize more of each of the respective proteins, and nucleotide chains.