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Cyanobacteria. (sÄ«'ÉnÅbÄktÄ­r`ÄÉ, sÄ«-Än'Åâ) or. photosynthetic bacteria bacteria[pl. of bacterium], microscopic unicellular prokaryotic organisms characterized by the lack of a membrane-bound nucleus and membrane-bound organelles.
A prokaryote is a unicellular organism that lacks a membrane-bound nucleus, mitochondria, or any other membrane-bound organelle. The word prokaryote comes from the Greek ÏÏÏ (pro) before and ÎºÎ¬ÏÏÎ¿Î½ (karyon) nut or kernel. Prokaryotes are divided into two domains, Archaea and Bacteria. In contrast, species with nuclei and organelles are placed in the third domain, Eukaryota.. Prokaryotes reproduce without fusion of gametes. The first living organisms are thought to have been prokaryotes. In the prokaryotes, all the intracellular water-soluble components (proteins, DNA and metabolites) are located together in the cytoplasm enclosed by the cell membrane, rather than in separate cellular compartments.