The photosystem II absorbs light to begin the electron transport chain of photosynthesis (P 68o ). P680 is activated when it absorbs light, and its electrons are then moved to an electron acceptor molecule.
As a result, P 680 develops into a potent oxidizing agent and fractures a water molecule to liberate oxygen.
Chlorophyll, a reactive molecule of Photosystem II, traps light energy, which then releases electrons at a higher energy level. In the chlorophyll a molecule, these electrons are replaced by electrons that originate indirectly from water molecules that are split, releasing protons (H +) and oxygen gas in the process.
At a lower energy level, the electrons travel from the primary electron acceptor to the reaction center of Photosystem I along an electron transport chain. A proton gradient is created as electrons move along this electron transport chain, and it is from this gradient that ATP is created. The Photosystem I absorbs light energy, which then releases electrons to another main acceptor. Other transporters transmit electrons from this acceptor to NADP +, where NADPH is created. The photosystem I electrons removed.
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