Cell theory

Definition

Cell theory is a fundamental principle in biology that states all living organisms are composed of cells, and all cells arise from pre-existing cells. It also asserts that the cell is the basic unit of life.

5 Must Know Facts For Your Next Test

1. The three main tenets of cell theory were developed by Schleiden, Schwann, and Virchow.
2. Cell theory applies to both prokaryotic and eukaryotic cells.
3. Rudolf Virchow contributed to cell theory with the concept of omnis cellula e cellula, meaning every cell originates from another existing cell.
4. Modern advancements in microscopy have provided evidence supporting the principles of cell theory.
5. Cell theory laid the groundwork for understanding cellular processes such as replication, metabolism, and heredity.

Review Questions

• Who are the scientists credited with developing the main tenets of cell theory?
• What does Rudolf Virchow's contribution 'omnis cellula e cellula' mean?
• How has modern microscopy advanced our understanding of cell theory?

Related terms

Prokaryotic Cell: A type of cell lacking a nucleus and other membrane-bound organelles.

Eukaryotic Cell: A type of cell with a nucleus enclosed within membranes.

Microscopy: The use of microscopes to view objects and areas of objects that cannot be seen with the naked eye.