http://lenti.med.umn.edu/~mwd/cell_www/chapter1/cell_chapter1.html Some introductory information and pictures of cells including an illustration of a prokaryotic cell.

http://esg-www.mit.edu:8001/esgbio/cb/org/animal.gif A beautifully colored picture of an animal cell but with no links.

http://esg-www.mit.edu:8001/esgbio/cb/org/organelles.html This illustrates a plant cell but the site has links to additional pages on the nucleus, ribosomes, and mitochondria. At these sites you will find drawings and/or electron micrographs.

http://lenti.med.umn.edu/~mwd/cell_www/cell_intro.html A good picture of the cell membrane and its constituents.

http://lenti.med.umn.edu/~mwd/cell_www/chapter2/membrane.html#SEMIPERM Additional details about the actual chemicals making up the cell membrane and a discussion of osmosis and diffusion.

http://lenti.med.umn.edu/~mwd/cell_www/chapter2/protein. html#MEMBRANE Active transporting proteins are discussed along with linked pictures illustrating their action.

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