The Light- Dependent Reactions of Photosynthesis.

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Presentation transcript:

The Light- Dependent Reactions of Photosynthesis

Photosynthesis take place in 2 phases: Light-Dependent reactions Light-Independent reactions

Light-Dependent Reactions  Take place in the thylakoid membranes  Light is absorbed by chlorophyll a and/or accessory pigments  These pigments are attached to pigment-binding proteins and arranged in an antenna system

Photosystems  There are 2 types of photosynthetic units:  Photosystem I  Photosystem II  Photosystem I rxn center is P700  Photosystem II rxn center is P680

Once e- is given up from reaction center, it enters an Electron Transport System  ETC used to generate energy molecules  ATP  NADPH  2 types:  Cyclic  Non-cyclic

Cyclic Electron Transport  Simplest light-dependent reaction: Only involves PSI  Light energy is transferred to P700 reaction center which gives up 2 e-  e-  1 o e- receptor  ETC  P700  Chemiosmosis generates ATP by photophosphorylation

Noncyclic Electron Transport  Involves PSI and PSII  Produces both ATP and NADPH  P700 e-  ETC  NADP +  P680 e-  ETC (chemiosmosis)  P700  Water is split by photolysis to replace P680 e-  mat/metabolism/photosynthesis.swf mat/metabolism/photosynthesis.swf

Let’s Review…  Main outputs of light-dependent rxns are:  NADPH from noncyclic  ATP from cyclic & noncylic  O 2 from photolysis  hill.com/sites/ /student_view0 /chapter10/animations.html# hill.com/sites/ /student_view0 /chapter10/animations.html#