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Samenvatting Thema 3: Stofwisseling: Assimilatie-Dissimilatie - Biogenie
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Samenvatting Thema 3: Stofwisseling: Assimilatie-Dissimilatie - Biogenie
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Stofwisseling / Metabolisme / Stof- en energieomzettingen= Het geheel van chemische reacties (= chemische reacties) in een organisme of in een cel, waarbij stoffen worden
omgezet in andere stoffen
Anabole reacties = assimilatie Katabole reacties = dissimilatie
energierijke bindingen energie komt vrij
grote moleculen opbouwen: afbraak tot kleine moleculen:
energie + kleine moleculen → grote engie rijke grote molecule → energie + kleine moleculen
molecule/binding
=> opbouwstofwisseling - energievragend => afbraakreactie - energie komt vrij
, Anabolisme
= Grotere biomoleculen worden gevormd uit kleinere
= Assimilatie = Opbouw Stofwisseling= Endo-energetische reacties
Koolstofassimilatie Voortgezette assimilatie
glucose bouwen vertrekkend van anorganische moleculen met grotere organische moleculen bouwen vertrekkend van
behulp van energie uit: kleinere moleculen met behulp van energie uit ATP
● licht: fotosynthese
● exo-energetische reacties: chemosynthese
voorbeelden: voorbeelden:
● Fotosynthese ● Disacharide bouwen (vertrekkend van monosacharide)
bij foto-autotrofen:
planten en sommige moneren&protisten
● Chemosynthese ● Proteïnen maken (vertrekkend van aminozuur)
enkel bij bepaalde bacteriën
assimilatie:
● koolstof
● stikstofassimilatie
● voortgezette
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