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Unformatted text preview: Chemiosmosis - The Mechanism of ATP Synthesis in Chloroplasts The thylakoid membrane is composed of a phospholipid bilayer (color phospholipids "B" light blue) and photosystem I and photosystem II. Although they both work simultaneously, it is best to look at them one at a time, starting with photosystem II. The first and most important event in either system is the capturing of light energy (color "E" orange) by the pigments associated with each photosystem. Color the pigments of Photosystem II (P2) dark green and the pigments of Photosystem I (P1) light green. Pigment 680 (color dark green) is associated with Photosystem II, and Pigment 700 (color light green) is associated with Photosystem I. When a photon of light strikes the reaction center of Photosystem II, it excites an electron. Two water molecules bind to an enzyme that splits water into hydrogen ions (aka protons) and releases an oxygen atom. Color the protons (H+) yellow and the oxygen atoms (O2) red. This process is called PHOTOLYSIS and is illustrated by the arrows labeled "L", which you should color pink. Two electrons are released in this process, and these electrons can be traced through photosystem you should color pink....
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