Khan Academy
Khan Academy: Biology: Structure of a Cell: Introduction to Cells
Learn about cell theory in this article. [12:29]
Vision Learning
Vision Learning: Cells: Discovery and Basic Structure
This module focuses on cell structure and how the organelles function together to form the smallest unit of life. The cell theory is also discussed along with the basics features of the cell. Site also includes an interactive practice...
Estrella Mountain Community College
Online Biology Book: Cells: Origins
Through full-color images and concise information, learn about the origin of cells. Discover some of the notable studies surrounding the history of life on Earth.
Estrella Mountain Community College
Online Biology Book: The Nature of Science and Biology
Use the scientific reasoning and critical thinking to take an in-depth look at the basics of biology.