ATP and photosynthesis

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Adenosine triosphosphate

ATP has three phosophate groups, the bonds between these groups are unstable, they release energy when they break by hydrolysis

ATP can be reformed from ADP + Pi in a condensation reaction

photophosphorylation occurs in the chloroplast during photosynthesis

oxidative phosphorylation occurs in the mitochondria during respiration

substrate-level phosphorylation occurs when Pi groups are transferred from donor molecules (when pyruvate is formed)

why ATP is great:

- it is an immediate energy source

- it can be made in one simple reaction

- it provides, small manageable amounts of energy


1) photons of light hit chloryphyll

2) e- become excited so leave chloryphyll

3) e- are passed along a chain of electron carriers, in the thylakoid membrane, losing energy    each time

4) the energy lost from e- is used to convert ADP + Pi to ATP

5) water molecules are split by photolysis to replace e- lost in PS2 (2H2O = 4H+ + 4e- +O2)


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