Are all bacteria prokaryotic cells?

Normally, all of bacteria are prokaryotic without any exception. However, a prokaryotic bacteria can be changed to equip eukaryotic metabolism artificially.

European researchers have modified the cellular machinery of Escherichia coli to produce a system for the production of proteins relevant for eukaryotic, particularly human, applications. E. coli, like most bacteria, fail to glycosylate the proteins they synthesize, but this system could change all that.