Download Light-Dependent Reactions (membranes of thylakoid

Light-Dependent Reactions (membranes of thylakoid discs)
1) Sunlight strikes chlorophyll molecules in thylakoid membrane.
2) Light energy transferred to electrons – they become excited.
3) Excited electrons passed from chlorophyll to electron transport chain
(series of proteins embedded in thylakoid membrane).
4) Each protein in the chain passes energized electrons along from
protein to protein. (Bucket Brigade). Small amounts of energy
released as electrons are passed along.
5) Some of this energy is used to form ATP from ADP or to pump H+
ions into center of thylakoid disc.
6) Electrons passed down 2nd electron transport chain.
7) NADP+ (electron carrier) carries the excited electrons to the stroma.
When carrying the excited electrons, NADP+ combines with a H+ ion
to become NADPH.
8) NADPH stores the electrons for use in the light independent reactions.
To replace electrons lost from chlorophyll……. (see whiteboard)