[Free Registration/Login may be required to access all resource tools.] Online activity summarizes the cell theory, describes four parts all cells have in common, and the importance of the work of Robert Hooke and Anton van Leeuwenhoek.

Video describes the development of the cell theory and some of the scientists and disagreements involved. [6:12] Includes a short quiz and a list of additional resources to explore.

The following tutorial is an explanation of cell theory.

Learn how the Cell Theory defines living organisms.

This study resource from Khan Academy provides practice questions for the MCAT. "Cell theory" questions are provided on this resource.

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...

This lesson covers the basic elements of cell theory.

Learn about the cell theory and levels of organization in a multicellular organism.

[Free Registration/Login may be required to access all resource tools.] Describes four parts all cells have in common.

Essay on the history of our knowledge of cells and the development of the cell theory.

Work samples, phenomena, assessment templates, and videos that directly address standard MS-LS1-1: cell theory.

Explanation of when the cell was discovered and how ideas have evolved into modern cell theory. Discover the cell structures and their functions.

[Free Registration/Login may be required to access all resource tools.] Cells make up all living things but not all cells look alike. This activity introduces cells, cell theory, and the levels of organization in organisms.

Learn about the endosymbiotic theory. This theory explains the evolution of cells from a mitochondria and chloroplast working together in a symbiotic relationship to the current cell structure.

[Free Registration/Login may be required to access all resource tools.] Learn about the evolution of eukaryotes which is explained by the endosymbiotic theory.

[Free Registration/Login may be required to access all resource tools.] Explains scientific theories and introduces several famous theories in biology.

Two multiple-choice quizzes about cells. The first is on cell theory, basic information about cells, and cell types. The second is on cell structures and functions.

In this module, students discover how each cell is organized to complete the function of producing and transporting proteins, and how cells relate to homeostasis of the body.

[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.

Learn about German Physiologist, Theodor Schwann, one of the scientists who helped develop the cell theory.

[Free Registration/Login may be required to access all resource tools.] Introduces cells, cell theory, and the levels of organization in organisms.

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.

Use the scientific reasoning and critical thinking to take an in-depth look at the basics of biology.

Take this self-checking, five question quiz over the discovery of cells and cell theory.