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All living things are made up of cells. Cells are the basic units of organization for all organisms on Earth. There are millions of cells that make up large organisms, such as a tree, an elephant, or a human. Each cell present has its own function, which makes it easier for organisms to grow and survive. Without these extremely small cells, life on Earth would be non-existent.
There are 2 types of cells present within the world: prokaryotes and eukaryotes. Each cell type is extremely important because they form different organisms. Prokaryotic cells do not have a nucleus, and therefore create things such as bacterial cells. Prokaryotes also do not have any membrane-bound organelles, which makes them the smallest type of cell. Eukaryotes, however, do have a nucleus and membrane-bound organelles. This makes them the larger sized cells. The two types of eukaryotic cells that are present on the planet are plant cells or animal cells.
For more information on cells, please visit the following websites:
Biology4Kids
Molecular Expressions
Animal Cell
Cells Alive
For questions contact Jamie Bozich at bozichjl@uwec.edu. Page last updated on 11/7/08