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Metabolic
Plants, algae, cyanobacteria
Photosynthesis – Light Reactions
Capture of light energy to produce ATP and NADPH, with O₂ as a byproduct.
Overview
The light-dependent reactions of photosynthesis occur in the thylakoid membranes of chloroplasts. Photosystems I and II absorb photons, driving electron transport that generates a proton gradient for ATP synthesis (photophosphorylation) and reduces NADP⁺ to NADPH. Water is split by Photosystem II, releasing O₂.
Cellular Location
Thylakoid membrane (chloroplast)
Clinical Significance
Foundation of nearly all food webs; responsible for atmospheric oxygen; key target for improving crop yields.