Prokaryote
Prokaryotes (or Monera) are some of the simplest living things.  They are unicellular organisms and they include two major divisions of simple living beings: bacteria, and Archaea.  They generally do not have a cell nucleus, nuclear membrane or cell organelles, however a small number of exceptions have been found.  Prokaryotes possess genetic material in the form of a single DNA loop called a Nucleoid that floats around freely inside the cell. Bacteria include the Cyanobacteria (formerly known as blue-green algae due to their photosynthetic capacity).