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Samenvatting Hoofdstuk 3 Plantencel en Celcyclus
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Dit is een samenvatting van hoofdstuk 3 'plantencel en celcyclus' van het boek raven biology of plants.
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Biodiversiteit plantenHoofdstuk 3: Plantencel en celcyclus
1. Prokaryoot vs eukaryoot
Prakaryote cellen Eukaryote cellen
Celkern nee ja
Celgrootte 1-10 micro m 5-100 micro m
Kernmembraan / Aanwezig
Organellen / Aanwezig
- Mitochondriën
- Chloroplasten
Cytoskelet / Aanwezig
- Microtubuli
- Actine filamenten
Dna Circulair (in nucleoïde) Lineair (in nucleus)
- Cytoplasma ja ja
- Ribosomen
- celmembraan
Prokaryoten = Archaea, Bacteria
Eukaryoten = Fungi, Animalia, Protisten, Plantae
Celtheorie:
- alle levende organismen zijn opgebouwd uit cellen
- cellen ontstaan zijn uit andere cellen (plant is verzameling van cellen)
- chemische reacties vinden plaats in cellen
- cellen bevatten erfelijke informatie vd organismen waar ze deel van uitmaken, w
overgegeven van moeder naar dochtercel
- kleinst levende eenheid in organisme
Organisme theorie:
- bekijkt het gehele organisme ipv de individuele cellen
- plant wormt cellen, cellen vormen geen planten
- bij planten w protoplasten niet gesplitst bij celdeling, wel door celplaat
, 2. Plantencel vs dierencel
plantencel Dierencel
Celwand ja /
Chloroplast ja nee
Vacuole + tonoplast ja nee
Plasmamembraan = scheidt protoplast van omgeving
= regelt transport van stoffen in en uit protoplast
= detecteren van reacties van signalen uit de omgeving
3. Nucleus (kern)
Functies:
- Controleren activiteiten vd cel
- Opslaan genetische info, doorgeven aan dochtercel tijdens celdeling
Inhoud:
- Nuceolus (met RNA)
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