Prokaryotic cells are simpler than eukaryotic cells and lack membrane-bound organelles. Here are the structures commonly found in prokaryotic cells:

Outermost Layer:

* Cell Wall: A rigid layer that provides structural support and protection, typically made of peptidoglycan.

* Capsule: A slimy, outer layer that helps the cell adhere to surfaces and evade the host's immune system (not present in all prokaryotes).

Cell Membrane:

* Plasma membrane: A thin, selectively permeable membrane that encloses the cytoplasm and regulates the passage of molecules into and out of the cell.

Internal Structures:

* Cytoplasm: The gel-like substance that fills the cell and contains the cell's internal components.

* Nucleoid: A region within the cytoplasm where the cell's DNA is located. The DNA is typically circular and is not enclosed by a membrane.

* Ribosomes: Small, granular structures responsible for protein synthesis.

* Plasmid: Small, circular DNA molecules that can replicate independently of the main chromosome. Plasmids often carry genes for antibiotic resistance or other beneficial traits.

* Flagella: Long, whip-like appendages that help the cell move.

* Pili: Short, hair-like appendages that help the cell attach to surfaces.

Note: Not all prokaryotes have all these structures. Some may lack flagella, pili, or even a capsule. The specific features of a prokaryotic cell can vary depending on the species and its environment.