ATP and photosynthesis
- Created by: olivia
- Created on: 07-01-13 16:01
ATP
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
LDR:
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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