Inside the Cell - from the National Institute of General Medical Sciences


Cells Alive - Animations of cell processes, good pictures

Molecular Expressions - Wonderful primer on animal, bacteria, plant cell and virus structures. Digital videos of cells in motion, microscopy, and mitosis. Part of the Molecular Expressions website by Florida State University in collaboration with Optical Microscopy at the National High Magnetic Field Laboratory.

Biology Tutorial - Good, free, online resource for a quick 'refresher' in such topics as cell basics, respiration, photosynthesis, DNA replication, viruses, etc.