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Samenvatting 10 voor Biologie - DNA-replicatie (H8.1) $6.04   Add to cart

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Samenvatting 10 voor Biologie - DNA-replicatie (H8.1)

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Wat is de structuur van DNA? Hoe repliceert DNA zich? Wat is helicase & wat doet het? De antwoorden op deze vragen en op nog veel meer vragen vind je terug in deze samenvatting! :)

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  • H8.1
  • January 20, 2024
  • 5
  • 2023/2024
  • Summary
  • Secondary school
  • 6
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, Biologie H8
§8.1: De structuur van DNA


Kern
Dna-molecuul




Nucleosoom
Nucleotide
A S
T P
Chromosoom S
P G S
C P Fosfaatgroep
S
P S
S A T Desoxyribose
Histonen met DNA (suiker)
Detail chromosoom (chromatine) H-brug


DNA→ Bevat erfelijke informatie van het organismse, polymeer van een keten nucleotiden Complementaire basen
Zit in de kern van lichaamscellen & voortplantingscellen in de vorm van: A tegenover T, g tegenover C
Chromatine → Bestaat uit DNA & histonen (eiwitten) Worden verbonden door h-bruggen
Nucleosoom → Eiwitbolletje van 8 histonen waar DNA-streng zich om wikkelt
Zorgt dat het dna-molecuul in de celkern past door het DNA te spiraliseren
Afschermen van de code in DNA, zodat stukken DNA alleen gebruikt worden wanneer nodig


Replicatie: verdubbeling van DNA
Gebeurt vóór de celdeling

Helicase DNA Polymerase Primase Ligase Leading strand
Leading strand




Lagging strand
Lagging strand
• Leading strand → hier wordt continu nieuw DNA gevormd
De DNA-dubbelspiraal wordt 'opengeritst' door het
• Lagging strand → hier wordt nieuw DNA in stukjes (Okazaki-
enzym 'helicase' door h-bruggen Te verbreken
fragmenten) aan elkaar geplakt door het enzym ‘ligase’

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