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samenvatting Genie Biologie 5.2 - thema 2, hoofdstuk 2
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thema 2, hoofdstuk 2: fotosynthese gebruik van afbeeldingen volgt de structuur van het boek ook eigen schematische tekeningen
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Fotosynthesechlorofyl
6 CO2 + 6 H2O C6H12O6 + O2
licht
Fotosynthese
o ≠ namen voor = proces
o Fotosynthese (nadruk op noodzaak van licht)
o Zetmeelsynthese (ook zetmeel wordt gevormd)
o Bladgroenwerking (vind plaats in bladgroenkorrels)
o Koolstofdioxide assimilatie of C-assimilatie
1. PIGMENTEN VAN DE FOTOSYNTHESE
Met behulp van chromatografie (scheidingstechniek om mengsels van
moleculen te scheiden)
Schrijven met kleur
Oplossen in de loopvloeistof – absorberen aan de drager
Stationaire fase (papier) + mobiele fase (loopvloeistof)
Soort zoekt soort (polair – apolair)
Chlorofyl b – chlorofyl a – xanthofyllen – carotenoïden
P132 weetje
Absorptiespectra van fotosynthetisch actieve pigment
Alle bladpigmenten ( < chromatografie) betrokken
bij de fotosynthese
Ze absorberen licht van ≠ golflengten
(absorptiespectrum: waaier van golflengtes die
geabsorbeerd worden)
Voornaamste: chlorofyl a (absorbeert rood en blauw
– reflecteert groen)
Chlorofyl a en b samen: groter bereik
Carotenoïden (ϐ-caroteen en luteïne: absorberen
blauw – reflecteren geel en oranje
2. FOTOSYNTHESEPROCES
Waar? In chloroplast
2 deelprocessen
o Lichtreactie: vorming van ATP en NADPH (licht E -> chemische E)
o Calvincyclus: omzetten van CO2 naar glucose
met verbruik van ATP en NADPH
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