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5’

ESTRUCTURA D’UN NUCLEÒTID
ÀCID FOSFÒRIC



DESOXIRIBOSA

3’

ADENINA
(groc)
GUANINA
(taronja)
BASE NITROGENADA

TIMINA
(verd)
CITOSINA
(blau)
ADENINA

citosina
GUANINA

TIMINA

CITOSINA

timina

Guanina
3’
5’

3’
5’

3’
5’



S'uneixen el
C 3’ del
primer
nucleòtid
amb el
fosfòric 5’del
següent per
formar la
cadena de
polinucleòtid
5’

3’
El nou filament
sintetitzat per la
DNA polimerasa
és antiparal·lel i
complementari al
filament 3’→5’.

3’

5’
3’

5’

Enllaç pont
d’hidrogen

3’

5’
5’

3’

3’

5’
Model tridimensional d'ADN

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