 A second model proposes that proto @-@ eukaryotic cells evolved from bacteria without an endosymbiotic stage . This model is based on the existence of modern planctomycetes bacteria that possess a nuclear structure with primitive pores and other compartmentalized membrane structures . A similar proposal states that a eukaryote @-@ like cell , the chronocyte , evolved first and phagocytosed archaea and bacteria to generate the nucleus and the eukaryotic cell . 
 A second model <a href='uninflect' title='1'><mark>proposes</mark></a> that proto @-@ eukaryotic cells evolved from bacteria without an endosymbiotic stage . This model is based on the existence of modern planctomycetes bacteria <a href='null_relcl' title='2'><mark>that</mark></a>possess a nuclear structure with primitive pores and other compartmentalized membrane structures . A similar proposal <a href='uninflect' title='3'><mark>states</mark></a> that a eukaryote @-@ like cell , the chronocyte , evolved first and phagocytosed archaea and bacteria to generate the nucleus and the eukaryotic cell . 
A second model propose dat proto @-@ eukaryotic cells evolved from bacteria without an endosymbiotic stage . This model is based on da existence of modern planctomycetes bacteria possess a nuclear structure with primitive pores and other compartmentalized membrane structures . A similar proposal state tdata eukaryote @-@ like cell , the chronocyte , evolved first and phagocytosed archaea and bacteria to generate the nucleus and tdaeukaryotic cell .