kloroplastide klorofülli sisaldavad spetsialiseerunud sisemembraanid, kus toimub valguse absorptsioon, fotosünteesi elektrontransportahel ja ATP süntees, A thylakoid is a membrane-bound compartment inside chloroplasts and cyanobacteria that contains chlorophyll. They are the site of the light-dependent reactions of photosynthesis including light absorbsion, electron transport chain and ATP synthesis.