Chem4kids
Chem4 Kids: Proteins
Here you can find some great information about proteins. Learn about a protein's primary structure, secondary structure, tertiary structure, and quaternary structure.
Chiral Publishing
Chiral Publishing: An Introduction to Chemistry: Protein Secondary Structures
Discover the alpha-helix and the beta sheet, both secondary structures of proteins. View diagrams and a 3-D model of the different parts of a protein molecule.