Transmission Electron Micrograph (TEM) of section of cytoplasmic bacteria in Trachelomonas; note cell walls, DNA regions, capsule outside cells. Bacteria are prokaryotes (DNA free in the cytoplasm with no nuclei or other membraned organelles such as mitochondria; DNA as a single circular molecule, not complexed with protein; sex unidirectional; small ribosomes; non cellulosic cell wall). Magnification: 30,000x.