Three Domain System of Classification 1
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Cell structure
DNA as a nucleoid
Thermophiles, acidophiles
True bacteria

Bacteria- true bacteria

Bacteria and archaea - cell structure

All - DNA as nucleic material.

Archaea - thermophiles and acidophiles.

Eukarya - Eukaryotic cells.

The bacteria are the organisms that are placed in the kingdom Monera. These organisms are having prokaryotic cell structures with chitinous capsule. They have DNA as nucleoid. Whereas the Archaebacteria are placed in Domain Archae which have most primitive characteristics. These organisms are mostly having similar cellular characteristics as that of bacteria. But they are thermophiles and acidophiles.

The eukaryota have the eukaryotic cells and well defined nucleus. So they are completely different from prokaryotic organisms. They may or may not have cell wall. They are all- autotrophic, heterotrophic saprophytic etc.