BIOL 1000 Lecture Notes - Lecture 28: Thylakoid, Light-Independent Reactions, Chemiosmosis
Document Summary
Chemiosmosis is the method of atp formation in cellular respiration within the mitochondria . Potential energy of a concentration gradient of hydrogen ions (h+) across a membrane powers atp synthesis . Gradient is created when electron transport chain uses energy released as it passes electrons down the chain to pump h+ across a membrane . Electron transport chain for photosynthesis is located within the thylakoid membrane of a chloroplast . Photoexcited electrons pass down the electron transport chain that connects the 2 photosystems . Hydrogen ions are pumped across the membrane from the stroma in the thylakoid space . Energy of concentration gradient drives h+ back across the membrane through atp synthase . Couples the flow of h+ to the phosphorylation of adp. Light energy derives electrons that originally came from water, to top of transport chain . Chemiosmosis production of atp in photosynthesis is called photophosphorylation . Chloroplasts transform light energy into chemical energy of atp .