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Prokaryotic cells may also have specialized features such as [[flagellum]] and [[pili]]. Prokaryotic cells can also carry accessory DNA known as [[plasmids]] that code for functions such as antibiotic resistance or the metabolism of lactose.  Plasmids are stored separately from the organism's [[genome]] and are shared between other prokaryotic cells.

Prokaryotic cells may also have specialized features such as [[flagellum]] and [[pili]]. Prokaryotic cells can also carry accessory DNA known as [[plasmids]] that code for functions such as antibiotic resistance or the metabolism of lactose.  Plasmids are stored separately from the organism's [[genome]] and are shared between other prokaryotic cells.

There are two kinds of prokaryotic cells: [[eubacteria]], or simply [[bacteria]], and [[archaebacteria]]. Both eubacteria and archaebacteria have [[cell walls]]; however, [[peptidoglycan]] is present in only the cell walls of eubacteria. The presence and amount of peptidoglycan can be determined [[by Gram staining]].

There are two kinds of prokaryotic cells: [[eubacteria]], or simply [[bacteria]], and [[archaebacteria]]. Both eubacteria and archaebacteria have [[cell walls]]; however, [[peptidoglycan]] is present in only the cell walls of eubacteria. The presence and amount of peptidoglycan can be determined by [[Gram staining]].

A eukaryotic cell is divided into a number of membrane bound compartments known as [[organelles]], each with its own structure and function. In a typical cell these components are:

A eukaryotic cell is divided into a number of membrane bound compartments known as [[organelles]], each with its own structure and function. In a typical cell these components are: