Editing Cell Theory and Architecture (section)

== Prokaryotic Architecture: Streamlined Efficiency ==

Prokaryotes (domains Bacteria and Archaea) represent the earliest forms of life. Their architecture is defined by simplicity and rapid metabolic efficiency, notably lacking membrane-bound organelles. 

[[File:Prokaryotic_Cell_Diagram.jpg|thumb|right|Diagram of a typical prokaryotic cell structure.]]

* '''Nucleoid:''' Unlike eukaryotes, prokaryotes do not have a true nucleus. Their genetic material—typically a single, circular chromosome—is localized in an irregularly shaped region of the cytoplasm called the nucleoid.
* '''Plasmids:''' Small, circular, extrachromosomal DNA molecules that often carry accessory genes, such as those responsible for antibiotic resistance.
* '''Ribosomes (70S):''' The sites of protein synthesis. They are free-floating in the cytoplasm and are structurally slightly smaller than their eukaryotic counterparts.
* '''Cell Envelope:''' Consists of a plasma membrane and a rigid cell wall (frequently composed of peptidoglycan in bacteria) that provides structural integrity. Many prokaryotes also possess a protective outer capsule.
* '''Appendages:''' Structures like flagella (for motility) and pili (for attachment and DNA transfer) extend from the cell surface.