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Khan Academy
Khan Academy: Light and Photosynthetic Pigments
What is light energy? Here we'll learn about the properties of light and how pigments such as chlorophylls absorb light energy.
University of Illinois
University of Illinois: The Photosynthetic Process
Site describes process of photosynthesis, including role of pigment molecules, electron transport, ATP synthesis, and carbohydrate synthesis. Includes links to illustrative graphics.