Talk about chlorophylls.

Found in thylakoid membrane Structure is the same among different types, is the same consists of Mg containing green porphyrin ring (similar to the iron of Hb) linked to a phytol tail (hydrocarbon tail) anchored in the lipid bilayer, all chlorophylls have the same structure but differ by side groups of the porphyrin ring. They absorb light because of their alternating double bond resulting in the electronic cloud, but they do not absorb all wavelengths, specific absorption peaks, they reflect green light making the plants green.