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.

Have you ever wondered how a virus or other infectious agent invades a cell to start an infection? Some objects, like viruses, bacteria, or other particles are too large to transport through the plasma membrane. So, cells engulf the...

Description of organelles. Links will take you to a glossary with pictures for many of the definitions. Ends with a quiz linked to answers.

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

[Free Registration/Login may be required to access all resource tools.] Tutorial describes the detailed structure and function of the plasma membrane, explains semipermeability, and summarizes the structure of a phospholipid.

Discover the purpose of the cell membrane to the cell's function.

This lesson will discuss the structure and function of the cell membrane. It is 3 of 6 in the series titled "Cell Membrane."

This lesson will discuss the structure and function of the cell membrane. It is 4 of 6 in the series titled "Cell Membrane."

This is a basic description of the structure of cell membranes. Site provides colorful pictures of each membrane.

This is a basic description of the structure of cell membranes. Site provides colorful pictures of each membrane.

This site has information on how facilitated diffusion of ions takes place through proteins, or assemblies of proteins, embedded in the plasma membrane. Includes a helpful diagram.

Interactive illustration displays the organelles of an animal cell and their functions.

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

[Free Registration/Login may be required to access all resource tools.] Describes the structure and function of the plasma membrane.

This is a basic description of the structure of cell membranes. Site provides colorful pictures of each membrane.

Carrier proteins and channel proteins are both involved in cell transport across the plasma membrane. Their functions, similarities, and differences are described in this resource. Includes examples for active, facilitated, and passive...

This tutorial compares prokaryotic and eukaryotic cellular organization and contrasts cells with viruses. Includes a practice quiz to test your knowledge.

This lesson will discuss the structure and function of the cell membrane. It is 5 of 6 in the series titled "Cell Membrane."

This lesson will discuss the structure and function of the cell membrane. It is 6 of 6 in the series titled "Cell Membrane."

[Free Registration/Login may be required to access all resource tools.] Describes the structure and function of the plasma membrane.

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

How do proteins move to the Golgi Complex? What types of secretion are controlled by the Golgi complex? How does Golgi complex regulate the insertion of plasma membrane proteins? Can proteins be transported back to the rough endoplasmic...

Practice for the MCAT with these questions about Cystic Fibrosis.

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