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 …

In cell biology, an organelle is a specialized subunit, usually within a cell, that has a specific function.The name organelle comes from the idea that these structures are parts of cells, as organs are to the body, hence organelle, the suffix -elle being a diminutive.Organelles are either separately enclosed within their own lipid bilayers (also called membrane-bound organelles) or …