What characteristic do all members of eukarya have that members of eubactaria do not have?

All members of Eukarya have a membrane-bound nucleus, which houses their genetic material. In contrast, members of Eubacteria lack a nucleus; their genetic material is not enclosed within a membrane and is typically organized in a single circular chromosome. This fundamental distinction in cellular organization is a key characteristic that differentiates eukaryotic cells from prokaryotic cells like Eubacteria.