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Photosynthesis

Light dependent reaction

TermDefinition
Where does the light dependent reaction occur This occurs in the Thylakoid membranes
There are 4 stages Photoionisation of chlorophyll Photolysis Chemiosmosis Production of ATP and reduced NADP
First step Photoionisiation Light energy absorbed by the chlorophyll and the energy results in the electrons becoming exited raising energy level to leave the chlorophyll. Therefore the chlorophyll has been ionised by light
Second step Photolysis of water Light energy absorbed by chlorophyll and splits water into oxygen H+ and e-
Third step Chemiosmosis The electrons that gained energy and left the chlorophyll move along a series of proteins in thylakoid membrane As they move along they release energy and some of the energy from electrons is used to pump the protons across chloroplast membranes.
Fourth step production of ATP and NADP The protons combine with the co enzyme NADP to become reduced NADP. Because the protons move from a high to low concentration gradient this is known as chemiosmosis.
Created by: yHya
 

 



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