http://lenti.med.umn.edu/~mwd/cell_www/cell.html
This Web site contains a very informative tutorial on cell biology appropriate for the novice or more advanced students. It covers such topics as what is a cell, and provides information on plants, bacteria, procaryotes, eucaryotes, cell membranes, phospholipids, internal organelles, cytoskeleton, genetic material, and related topics. Includes color pictures and diagrams to aid in understanding.