صفحه محصول - پاورپوینت Photosynthesis & The Hill Reaction

پاورپوینت Photosynthesis & The Hill Reaction (pptx) 25 اسلاید

دسته بندی : پاورپوینت

نوع فایل : PowerPoint (.pptx) ( قابل ویرایش و آماده پرینت )

تعداد اسلاید: 25 اسلاید

قسمتی از متن PowerPoint (.pptx) :

Photosynthesis & The Hill Reaction Chloroplasts Phospholipid bilayer Dark Reaction – Calvin Cycle Light Reaction - ETC Photosynthesis Chloroplasts of plants capture light energy from the sun and convert it to chemical energy stored in sugar and other organic molecules 6CO2 + 12H2O + light energy C6H12O6 + 6O2 + 6H2O Photosynthesis Figure 8.3 in Life The Three Parts of Photosynthesis ETC Photosystem II Photosystem I Calvin-Benson Cycle Photosystems are light reactions because they directly require light to proceed Calvin-Benson Cycle is a dark reaction because it doesn’t directly require light to proceed Electron Transport Chain Photosystem II occurs first – Does anyone know why II is first? Step 1 Photosystem II absorbs light An e- is excited to a higher energy level in the reaction center chlorophyll (P680) and is captured by primary e- acceptor Oxidized chlorophyll is now a very strong oxidizing agent (e- hole must be filled because it wants an e-) Electron Transport Chain Step 2 An enzyme extracts e- from H2O and supplies them to P680 Replaces each e- that chlorophyll lost when it absorbed light energy Rxn splits water molecule into 2-hydrogens and 1-oxygen molecule 2 Oxygen molecules form O2 Electron Transport Chain Step 3 Photo-excited e- passes from primary e- acceptor of Photosystem II to Photosystem I by way of ETC Step 4 e- cascade down ETC, exergonic fall to lower energy level is harnessed by the thylakoid membrane to produce ATP This ATP provides energy for the synthesis of sugar during Calvin cycle Electron Transport Chain Step 5 e- reaches bottom of ETC it fills e- hole in P700 (reaction center in Photosystem I) Replaces each e- that chlorophyll lost when it absorbed light energy e- is excited to a higher energy level in the reaction center chlorophyll (P700) is captured by primary e- acceptor