Prokaryotes include bacteria and archaea, two of the three domains of life. Prokaryotic cells were the first form of life on Earth, characterized by having vital biological processes including cell signaling. They are simpler and smaller than eukaryotic cells, and lack a nucleus, and other membrane-bound organelles. The DNA of a prokaryotic cell consists of a single circular chromosome that is in direct contact with the cytoplasm. The nuclear region in the cytoplasm is called the nucleoid. Most prokaryotes are the smallest of all organisms, ranging from 0.5 to 2.0 μm in diameter.
prokaryotes include bacteria and archaea two of the three domains of life prokaryotic cells were the first form of life on earth characterized by having vital biological processes including cell signaling they are simpler and smaller than eukaryotic cells and lack a nucleus and other membrane-bound organelles the dna of a prokaryotic cell consists of a single circular chromosome that is in direct contact with the cytoplasm the nuclear region in the cytoplasm is called the nucleoid most prokaryotes are the smallest of all organisms ranging from 05 to 20 μm in diameter