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PART 3 BIOLOGIA

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apunts de bio per a examen

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August 25, 2022
Number of pages
9
Written in
2022/2023
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Josep
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TEMA 4: ÀCIDS NUCLEICS

- Conservació, transmissió i traducció de la informació genètica. Són molècules
informatives.
Es betta perquè l’enllaç està a dalt i D
perquè el CH2 també està a dalt.

Es una penta.




BASES NITROGENADES:




PENTOSES:




Al carboni 2’ hi ha el oxi

, NUCLEÒTID: base nitrogenada + pentosa + fosfat (s)

NUCLEÒSID: base nitrogenada + pentosa




NUCLEÒTIDS:




POLINUCLEÒTIDS:
Al carboni 3’ en una reacció de condensació
s’uneix a un altre nucleòtid pel grup fosfat.

Aquest procés té una energia lliure de
Gibbs de +25 kJ/mol, per tant no es
espontània. La hidròlisis es favorable. Si no
es catalitza no es produeix
(metaestabilitat)

Examen:

Esquerra: enllaç fosfoèster

Dreta: enllaç dièster .
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