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PART 3 BIOLOGIA
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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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