Difference between revisions of "Cell"
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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> | ||
| + | ==Components of a Cell== | ||
| + | |||
| + | 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: | ||
| + | * [[Nucleus]] | ||
| + | * [[Endoplasmic reticulum]] | ||
| + | * [[Golgi complex]] | ||
| + | * [[Mitochondrion]] | ||
| + | * [[Lysosome]] | ||
| + | * [[Peroxisome]] | ||
| + | * [[Vescicle]]s | ||
| + | |||
| + | A prokaryotic cell lacks individual compartments. | ||
Revision as of 01:00, April 30, 2008
The cell is the smallest unit of life capable of independently reproducing itself. It is a small, watery, compartment filled with chemical-based machinery and a complete copy of the organism's genome.
There are two main types of cells: prokaryotic[1] cells, which lack a nucleus, and eukaryotic[1] cells, with a nucleus separated from cytoplasm by a nuclear membrane.
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.
There is no consensus on the exact number of cells in a human body, though the number ranges from 10 to 100 trillion cells.[2]
Components of a Cell
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 prokaryotic cell lacks individual compartments.