Prokaryotic structures are the basic components of prokaryotic cells, which include bacteria and archaea. These cells lack a nucleus and membrane-bound organelles. Instead, they have a simple structure consisting of a cell membrane, cytoplasm, ribosomes, and genetic material in the form of a single circular DNA molecule. Some prokaryotes also have additional features like a cell wall, flagella for movement, and pili for attachment. The cell wall provides structural support and protection, while the cell membrane regulates the entry and exit of substances. Prokaryotic cells are typically smaller than eukaryotic cells and reproduce asexually through binary fission. Their simplicity allows them to thrive in diverse environments, making them essential for various ecological processes.