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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 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.
The production of carbohydrates at the end of photosynthesis is not a simple process and occurs in 2 different stages known as the Dark and Light Reaction. The Light Reaction of photosynthesis should be properly called the Light Dependent Reaction because this is the only stage that captures energy in light. The dark reaction, also known as the Light Independent Reaction, functions independently of light and cannot capture energy.