City University of New York
Exploring Life@bi Odot Edu: Cell Theory
Essay on the history of our knowledge of cells and the development of the cell theory.
CK-12 Foundation
Ck 12: Life Science: 2.3 Cell Theory
Learn about the cell theory and levels of organization in a multicellular organism.
CK-12 Foundation
Ck 12: Life Science: Cell Biology
[Free Registration/Login may be required to access all resource tools.] A cell is the smallest structural and functional unit of an organism. Learn more about cell biology in this learning module produced by CK-12.
Other
Miami University: Cellular Nature of Life?
Basic information about cells in an outline form. Gives good information in an abbreviated format.