This lesson covers the basic elements of cell theory.

[Free Registration/Login may be required to access all resource tools.] Covers the common shapes and features of prokaryotic cells.

Wikipedia offers brief but accurate information on cytoplasm, the matter contained within the plasma membrane of a cell.

Reference information about the study of cells. Includes a chart comparing plant and animal cells and one examining the structure of a cell.

Provides a labeled diagram of a plant cell and descriptions of the characteristics and functions of many of its organelles.

This site from the Wikipedia Encyclopedia describes the process of exocytosis and what is accomplished by the process. Throughout this brief article, links are provided for additional information on the subject.