Prokaryote: cyanobacteria

The difference between prokaryotes and eukaryotes is that, compared with eukaryotes, prokaryotes have no formed nucleus, no nuclear membrane and nucleoli, and the nucleoplasm is concentrated in the central nuclear region, with no chromosomes, only a filamentous DNA molecule, which does not combine with protein; There is only one kind of organelle in cytoplasm-ribosome; The cell wall consists of special sugars and peptides, which is different from the cell wall of eukaryotic cells. The cell size is generally below 70um in diameter, and most of them are single cells. In terms of metabolic types, they are anaerobic or aerobic, most of them live in heterotrophic mode, and a few of them are autotrophic by photosynthesis or chemical synthesis.