http://learn.genetics.utah.edu/content/begin/cells/CELLS IN PERSPECTIVEIn 1665, Robert Hooke coined the term cell to describe the structures he could see in cork with some of the first microscopes. Since then, technology has given us an increasingly complex view of the basic unit of life.
Some of the cool interactive pages on this site:
CELL SIZE AND SCALEHow big are cells compared with other objects, molecules and atoms?
http://learn.genetics.utah.edu/content/begin/cells/scale/ (Move the horizontal scroll to the right for an incredible representation of size & scale.)
INSIDE A CELLSee parts of a cell in action.
http://learn.genetics.utah.edu/content/begin/cells/insideacell/(Put your cursor over the cell & click.)
DROPPING SIGNALSCell signals travel through the body, coming in contact with many cell types. The response depends on the type of cell the signal reaches.
http://learn.genetics.utah.edu/content/begin/cells/signals/ ===
I'm not able to get the animated cell communication page to work. Too bad, cuz it looks fascinating.