National Institutes of Health
National Institute of General Medical Sciences: Inside the Cell
Very good science e-book that details why cells are the fundamental unit of life and why our health depends on what happens within the many different cells that make up our body. Each chapter is presented separately and the book can also...
Science Education Resource Center at Carleton College
Serc: Black Smokers: Life Forms
This educational web site features life forms of deep sea hydrothermal systems. Hosted by the American Museum of Natural History, this site offers a brief introduction of the community and then focuses on Vestimentiferan tube worms,...
Other
Miami University: Cellular Nature of Life?
Basic information about cells in an outline form. Gives good information in an abbreviated format.
My Science Site
Life Systems: Cells, Tissues, Organs
Extensive site for teachers provides some helpful resources that pertain to plant and animal cells. Includes a microscope diagram as well as plant, animal and pond labs. Also contains links to structures and mechanisms, matter and...
Earth Life
Earthlife: Cells
Thorough introduction to cells and their importance to life. Includes various types of cells and their function. Good diagrams of the different types of cells.
Cells Alive
Cells Alive!: Plant, Animal, and Bacteria Cell Models
Find animated diagrams that describe both eukaryotic cells and prokaryotic cells. There are models for animal, plant, and bacteria cells.
CK-12 Foundation
Ck 12: Life Science: 2.3 Cell Theory
Learn about the cell theory and levels of organization in a multicellular organism.
University of Arizona
Studying Cells Tutorial
Good place to start to learn about cells. Includes a step-by-step tutorial describing the process of cell analysis.