University of Arizona
The Biology Project: Cell Membrane Tutorial
Great overview of cell membranes. The site presents the information as a tutorial with multiple choice questions to guide the learner. Very well designed site on cell membranes.
City University of New York
The World of Cells: Endo and Exocytosis
The two processes are compared on a brief essay. Use this for an introduction or general review material.
Ohio State University
Ohio State University: Cell Membranes
Diagrams and animations help you understand the basics of cell membrane structure and function.
Khan Academy
Khan Academy: Ap Biology: Cell Structure and Function: Membrane Transport
Practice exercise on membrane transport. This is new content.
National Health Museum
Access Excellence: Description of "Cell Membrane Surface Area Demos"
In this hands on site, you will find several simple, fun, cheap, and educational surface area demonstrations to use when studying cell membranes.