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[[File:HeLa cells stained with Hoechst 33258.jpg|thumb|HeLa cells stained with Hoechst 33258|right]] [[File:Leeuwenhoek Microscope.png|thumb|Leeuwenhoek Microscope|left]] [[File:Hooke-microscope.png|thumb|Hooke-microscope.png]] [[File:Cork Micrographia Hooke.png|thumb|Cork Micrographia Hooke|right]] [[File:PSM V22 D156 Matthias Jacob Schleiden.jpg|thumb|PSM V22 D156 Matthias Jacob Schleiden|right]] [[File:Schwann Theodore.jpg|thumb|Schwann Theodore|right]] '''Cell theory''' is a fundamental scientific theory in [[biology]] that describes the properties of [[cells]], the basic unit of life in all living organisms. The theory was first developed in the mid-19th century and has since become a cornerstone of modern biological sciences.
== History ==
The development of cell theory began with the invention of the [[microscope]] in the 17th century. [[Robert Hooke]] was the first to describe cells in 1665 when he observed the structure of cork under a microscope. Later, [[Anton van Leeuwenhoek]] made significant improvements to the microscope and was the first to observe living cells, including [[bacteria]] and [[protozoa]].
In 1838, [[Matthias Schleiden]], a German botanist, proposed that all plants are composed of cells. The following year, [[Theodor Schwann]], a German physiologist, extended this idea to animals, stating that all living things are made up of cells. This marked the formulation of the first two tenets of cell theory:
# All living organisms are composed of one or more cells.
# The cell is the basic unit of structure and organization in organisms.
In 1855, [[Rudolf Virchow]], a German physician, added the third tenet to cell theory:
# All cells arise from pre-existing cells.
== Tenets of Cell Theory ==
Cell theory consists of three main principles:
# All living organisms are composed of one or more cells.
# The cell is the basic unit of structure and organization in organisms.
# All cells arise from pre-existing cells.
== Modern Additions ==
Modern cell theory has expanded to include several additional concepts:
* Cells contain [[hereditary]] information (DNA) that is passed from cell to cell during cell division.
* All cells are essentially the same in chemical composition.
* All energy flow (metabolism and biochemistry) of life occurs within cells.
== Implications ==
Cell theory has profound implications for all biological sciences. It underpins the understanding of the structure and function of all living organisms, from the simplest [[unicellular]] organisms to complex [[multicellular]] organisms, including [[humans]]. It also provides the foundation for fields such as [[genetics]], [[biochemistry]], and [[molecular biology]].
== See Also ==
* [[Cell (biology)]]
* [[Microscopy]]
* [[Cell division]]
* [[Cellular respiration]]
* [[Genetics]]
* [[Molecular biology]]
== References ==
{{Reflist}}
{{Commons category|Cell theory}}
[[Category:Cell biology]]
[[Category:Biological theories]]
[[Category:History of biology]]
[[Category:Scientific theories]]
{{Biology-stub}}

Cell theory - Revision history

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