Photosynthesis

Photosynthesis

1. Light Dependent Reaction

   • Electrons in Chlorophyl A gain energy from electrons
   • Photolysis of water
     • 2H2O -> 4H+ + 4e- + O2
     • Increase the conc. of protons in thylakoid space
   • Protons only cross membrane through ATP synthase channels
     • Structure of enzyme changes catalysing the reaction of ADP + Pi -> ATP
     • Protons are taken up by NADP becoming reduced NADP which goes on to next stage

2. Calvin Cycle

   • CO2 diffuses into stroma
     • Reacts with RuBP to give 2 molecule of GP
       • Glycerate Phosphate
       • Carbon fixation
   • Reduced NADP reduces GP to TP using energy from ATP
     • NADP is reformed and goes back to light-dependent reaction
   • Some TP molecules are converted to organic stubstances
     • Eg. Glucose
   • Most TP are used to regenerate RuBP using ATP from light dependent reaction

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