Proteins, Lipids, Starches, and Sugars
An interactive animation that explores the structure and function of proteins
DNA
Look at the history of DNA discovery, the genetic code, genomes, etc. Great DNA site! Registration is free!
Food Tests
A good website that helps in labs to test for starch, sugar, proteins, or lipids
Descriptions of the tests used in lab to test for starch, sugars, lipids, and proteins. A great overview of these tests!