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44597
Light dependent reaction
Description
Biology Mind Map on Light dependent reaction, created by ewelinaskula on 12/04/2013.
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biology
biology
Mind Map by
ewelinaskula
, updated more than 1 year ago
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Created by
ewelinaskula
over 11 years ago
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Resource summary
Light dependent reaction
Occurs in thylakoids
Involves capture of light
Oxidation and reduction- oxidation results in energy being given out, reduction- energy taken in
Annotations:
Oxidation loss of electrons Reduction gain of electrons
Making ATP
Chlorophyll molecule absorbs light Energy
Boosts energy of of a pair of electrons -they are in an exited state
Electrons leave the chlorophyll molecule are taken up by an electron carrier
Chlorophyll molecules has been oxidised, the electron carrier reduced
The electrons are passed along a number of electron carriers in a series if oxidation-reduction reactions
Electron carrier form a transfer chain in the membrane of the thylakoids
Each new carrier- lower energy this lost energy is used to combine inorganic phosphate molecule with an ADP to make ATP
ATP + H2O => ADP + Pi + energy
Photolysis of water
Lost Chlorophyll electrons are replaced
Provided from water molecules that are split using light energy
2H2O=> 4H+ + 4e- + O2
H+ ions are taken up by a electron carrier called NADP And becomes reduced to NADPH which then enters the light- independent reaction
NADPH is important because it is a further potential source of chemical energy
O2 byproduct used in respiration or diffuses out of the leaf
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