Explore the fundamentals of computer science by building an interactive computer model of cells in Scratch. No previous experience in computer programming is required. Programming Cells was created by Dr. Jeff Saucerman, Professor of Biomedical Engineering at the University of Virginia.

All cells, organs and tissues of a living organism are built of molecules. Some of them are small, made from only a few atoms. There is, however, a special class of molecules that make up and play critical roles in living cells. These molecules can consist of many thousands to millions of atoms. They are referred to as macromolecules (or large biomolecules).