Light- Dependent Reactions

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Light- Dependent Reaction

Energy from the light raises the energy level (excites) two electrons in PSI and PSII to a higher energy level

Electrons leave PSII and are transported along many electron carriers, all in the thylakoid membrane

The electrons pass between the electron carriers through a series of oxidation and reduction reactions, losing energy (photophosphorylation)

The electrons lost are replaced through the splitting of water (photolysis) giving oxygen gas, hydrogen and electrons

The electrons from water replace the ones lost. Chloropyll no longer positively charged

Hydrogen ion concentration in the thylakoid also raised

The electrons that pass along the electron transport chain combine with co- enzyme NADP and hydrogen ions forming NADPH.  

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