Prokaryotes such as bacteria
monad
A single-celled organism without an organized nucleus is a prokaryote.
Kingdom Monera Prokaryotic single-celled with no nucleus
Bacteria is a single celled organism that lacks a nucleus, if that helps at all.
prokaryotic
procaryote
prokaryote
eukaryotes
protists
Eukaryotes can be single-celled or multi-celled and have a defined internal organization with a nucleus and membrane-bound organelles. Prokaryotes are typically single-celled and lack a true nucleus or membrane-bound organelles in their structure.
These single celled organisms are called prokaryotes.
A prokaryote is a single-celled organism with no definite nucleus and no definite nuclear membrane. Compared to a eukaryote which can be single-celled or multi-cellular and has a true nucleus with a nuclear membrane.