Well, there's two ideas that I know of that I don't yet want to go into, either eukaryota and archaea formed from a common ancestor, or that eukaryota arose from some archaea. Either way, it's clear we're not from bacteria, and we have a lot in common (from a certain perspective...) with archaea; the method of DNA replication, RNA transcription, and protein synthesis.

To whoever figured these things out... nice one