6. REMEMBER THAT VISIBLE LIGHT IS ONLY A SMALL PORTION OF THE ENERGY COMING FROM THE SUN THE AMOUNT OF ENERGY IN LIGHT IS DETERMINED BY ITS WAVELENGTH ï THIS ALSO DETERMINES THE COLOUR OF LIGHT
7. THE JOB OF PIGMENTS IS TO ABSORB SPECIFIC WAVELENGTHS OR PHOTONS OF LIGHT. THIS ENERGY IS TRANSFERRED TO ELECTRONS ï THESE âcatchingâ PIGMENTS ARE CALLED ANTENNA COMPLEXES
11. THE EXCITED ELECTRONS THEN TRANSFER ENERGY FROM PIGMENT TO PIGMENT IN THE PHOTOSYSTEM UNTIL IT REACHES A REACTION CENTRE (chlorophyll a) AN ELECTRON IS THEN âKICKEDâ TO A HIGHER E-LEVEL REDOX REACTIONS THEN MOVE THE ELECTRON TO A âPRIMARY ELECTRON ACCEPTORâ CALLED PLASTOQUINONE or PQ ï I.O.U. CONCEPT !!!!!
14. ENERGY HAS BEEN TRANSFERRED FROM SOLAR OR RADIANT ENERGY (light) INTO CHEMICAL POTENTIAL ENERGY ( PQ ) JUST AS IN THE ETC IN RESPIRATION THE ELECTRONS ARE THEN MOVED FROM ONE PROTEIN TO ANOTHER ALONG THE MEMBRANE (PQ ï CYTOCHROME COMPLEXES ï PLASTOCYANIN Pc ï P700 ï FERREDOXIN Fd) THIS CAUSES H+ TO BE PUMPED INTO THE LUMEN
15. EVENTUALLY THE ELECTRONS REACH NADPH REDUCTASE â WHICH ATTACHES THE ELECTRONS AND SOME H+ TO NADP+ CREATING NADPH H+ THAT BUILDS UP IN THE LUMEN CREATE AN ELECTROCHEMICAL GRADIENT . AS THIS EQUALIZES THE H+ PASS THROUGH ATP Synthase AND CATALYZE ADP + Pi ï ATP
28. THE ENZYME RUBISCO CATALYZES THE FIXATION OF ATMOSPHERIC CO2 INTO THE TWO 3-PG MOLECULES IT WORKS VERY SLOWLY AND MANY COPIES ARE NEEDED TO MAKE THE PROCESS POSSIBLE RUBISCO MAY ACCOUNT FOR UP TO Âœ THE PROTEIN IN A LEAF ï EXTREMELY ABUNDANT
37. IN PLANTS WHERE H20 LOSS IS A SERIOUS PROBLEM (DESERT PLANTS) CAM PHOTOSYNTHESIS OCCURS LEAVES OPEN AT NIGHT AND STORE C02, DO C-FIXATION AND THEN STORE THE C4 PRODUCTS TO BE USED DURING THE DAY IN THE CALVIN CYCLE (C3)