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.
Khan Academy
Khan Academy: The Structure and Function of Globular Proteins
The structure of a machine's parts in relation to one another and the proper functioning of the machine itself, applies not just to the machines is, but also to the ones at work inside our bodies. These molecular machines, called...
Sophia Learning
Sophia: Quaternary Structure of Proteins: Lesson 2
This lesson will explain the quaternary structure of a protein. It is 2 of 2 in the series titled "Quaternary Structure of Proteins."