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Photosynthesis can be divided into two stagesâthe light dependent reaction and the light independent (or dark) reactions. During the light reactions, an electron is stripped from a water molecule freeing the oxygen and hydrogen atoms. The free oxygen atom combines with another free oxygen atom to produce oxygen gas which is then released.
In photosynthesis, the light-dependent reactions take place on the thylakoid membranes. The inside of the thylakoid membrane is called the lumen, and outside the thylakoid membrane is the stroma, where the light-independent reactions take place.The thylakoid membrane contains some integral membrane protein complexes that catalyze the light reactions.There are four major protein complexes in the thylakoid membrane: Photosystem II (PSII), Cytochrome b6f complex, Photosystem I (PSI), and ATP synthase.he net-reaction of all light-dependent reactions in oxygenic photosynthesis is: 2 H 2O + 2 NADP+ + 3ADP + 3P i â O 2 + 2NADPH + 3ATP. The two photosystems are protein complexes that absorb photons and are able to use this energy to create an electron transport chain.