Biologi fotosintesis

PRESENTASI BIOLOGI SMAN 1 SIDOARJO XII-IA 4 2011/2012

PRESENTASI BIOLOGI FOTOSINTESIS REAKSI TERANG

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FOTOSINTES REAKSI TERANG 1. PENGERTIAN FOTOSINTESIS 2. TEMPAT TERJADINYA FOTOSINTESIS 4. PROSES FOTOSINTESIS REAKSI TERANG 5. FAKTOR-FAKTOR YANG MEMPENGARUHI FOTOSINTESIS 3. CAHAYA FOSFORILASI SIKLIK DAN NONSIKLIK

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[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Chloroplast Mesophyll 5 µm Outer membrane Intermembrane space Inner membrane Thylakoid space Thylakoid Granum Stroma 1 µm

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Light Chloroplast NADP  ADP + P RuBP 3-PGA Light reactions Calvin cycle Electrons G3P Cellular respiration Cellulosse Starch Other organic compounds

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[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],NADP+ + H+ + 2e- —> NADPH 3. Setelah itu mereka bergerak lagi ke rantai transpor elektron, yang membawa mereka melewati pheophytin, plastoquinon, komplek sitokrom b6f, plastosianin, dan akhirnya sampai di fotosistem I, tepatnya di P700. 4. Perjalanan elektron diatas disebut juga dengan "skema Z". Sepanjang perjalanan di rantai transpor, dua elektron tersebut mengeluarkan energi untuk reaksi sintesis kemiosmotik ATP, yang kemudian menghasilkan ATP . 5. Sesampainya di fotosistem I, dua elektron tersebut mendapat pasokan tenaga yang cukup besar dari cahaya matahari. Kemudian elektron itu bergerak ke molekul akseptor, feredoksin, dan akhirnya sampai di ujung rantai transpor, dimana dua elektron tersebut telah ditunggu oleh NADP+ dan H+, yang berasal dari penguraian air. 6. Dengan bantuan suatu enzim bernama Feredoksin-NADP reduktase, disingkat FNR, NADP+, H+, dan elektron tersebut menjalani suatu reaksi: 7. NADPH , sebagai hasil reaksi diatas, akan digunakan dalam reaksi Calvin-Benson, atau reaksi gelap NADP+ + H+ + 2e- —> NADPH

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Biologi fotosintesis

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