Ducksters
Ducksters: Biology for Kids: Lipids and Fats
Investigate the organic molecules lipids which include fats, steroids, and waxes including saturated and unsaturated fats as well as interesting facts on this site.
CK-12 Foundation
Ck 12: Biology: Earth Forms and Life Begins Study Guide
This comprehensive study guide covers the main terms and concepts needed for a unit on the origin of life.
University of Illinois
University of Illinois: Molecular Biology Cyberlab: Experiment 2: Gel Electrophoresis of Dna
A very good page that uses a Q&A format to describe the process of gel electrophoresis. Interactive in a rudimentary way.
Science Struck
Science Struck: Ribose vs. Deoxyribose
Explains what ribose and deoxyribose are, their chemical structure and properties, similarities and differences, their functions, and their biological importance.