Changes

A [[bacterium]] is a simple cell without a [[nucleus]] to protect its [[genetic information]].   

A [[bacterium]] is a simple cell without a [[nucleus]] to protect its [[genetic information]].   

A [[virus]] requires structures in a cell's [[cytoplasm]] to assemble copies of itself.

A [[virus]] requires the gene and protein building machinery in a cell to assemble copies of itself, however is not considered a cell by itself.

There is no consensus on the exact number of cells in a human body, though the number ranges from 10 to 100 trillion cells.<ref>Wile, Jay L. ''Exploring Creation With General Science''. Anderson: Apologia Educational Ministries, Inc. 2000</ref>

There is no consensus on the exact number of cells in a human body, though the number ranges from 10 to 100 trillion cells.<ref>Wile, Jay L. ''Exploring Creation With General Science''. Anderson: Apologia Educational Ministries, Inc. 2000</ref>

==Types of cells==

==Types of cells==

There are two main types of cells: prokaryotic<ref name="spell">Also spelled ''procariotic'' or ''procaryotic'' and ''eucariotic'' and ''eucaryotic''.</ref> cells, which lack a nucleus, and eukaryotic<ref name="spell" /> cells, with a nucleus separated from cytoplasm by a nuclear membrane.

There are two main types of cells: prokaryotic<ref name="spell">Also spelled ''procariotic'' or ''procaryotic'' and ''eucariotic'' and ''eucaryotic''.</ref> cells, which lack a nucleus and certain [[organelles]], and eukaryotic<ref name="spell" /> cells, with a nucleus separated from cytoplasm by a nuclear membrane.

Each cell contains a complete copy of the organism's [[genome]].

Each cell contains at least one complete copy of the organism's [[genome]].

 

 

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.

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:

* [[Golgi complex]]

* [[Golgi complex]]

* [[Mitochondrion]]

* [[Mitochondrion]]

* [[Lysosome]]

* [[Lysosome]]

* [[Peroxisome]]

* [[Peroxisome]]

* [[Vescicle]]s

* [[Vescicle]]s

==Notes==

==Notes==