nucleul Flashcards

1
Q

structura

A

prezinta o membrana dubla cu pori
partea ext. a membranei se continue cu R.E.
nucleoplasma (carioplasma)
cariolimfa-partea lichida,sistem coloidal
filament cu cromatina
fiecare filament cu cromatina contine un cromozom despiralizat.
nucleoli(1 sau 2) au rol in diviziunea celulei

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2
Q

ADN

A

2 catene polinucleotidice infasurate in jurul unui ax comun,complementare si antiparalele.

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3
Q

ce contine un nucleotid?

A

o baza azotata (purinice/primidinice)
un zahar (dezoxiribaza)
un radical fosfat

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4
Q

ARN

A

rol in sinteza proteinelor ,un singur lants polinucleotidic

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5
Q

cele 3 tipuri de ARN?

A

ARN-mesager-copiaza informatia genetica si o transfera la ribozomi fare o traduc in enzime
ARN-transfer-transporta aminoacizii in ribozomi
ARN-ribozomial-participa la sinteza proteinelor

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