núcleo Flashcards

1
Q

funciones del núcleo

A

almacena ADN
sintetiza ARN

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2
Q

compuesto por

A

ADN e histonas
ARN nacientes
maquinaria de replicación, reparación, splicing y transcripción

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3
Q

partes del núcleo

A

envoltura nuclear
membrana interna y externa
poros nucleares
nucléolo
matriz
cromatina

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4
Q

proteína que contribuye a transcripciones

A

polimerasas

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5
Q

ADN + histonas

A

cromatina

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6
Q

las 2 membranas del núcleo son

A

bicapas lipídicas

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7
Q

tetámetro tiene:

A

2 H2A
2 H2B
2 3
2 4

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8
Q

proteínas que compactan ADN formando nucleosomas

A

histona

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9
Q

niveles de compactación

A

1 ADN
2 Nucleosomas
3 fibras de 30 nm
4 loops
5 cromosomas

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10
Q

como se le llama al ADN que no se descompacta en la división celular

A

10% heterocromatina

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11
Q

como se le llama al ADN que sí se descompacta en la división celular

A

eucromatina (más accesible para transcripción de ARN)

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12
Q

4 modificaciones de colas-N terminales

A

metilaciones
acetilaciones
fosforilaciones
ubiquitinaciones

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13
Q

reduce atracción entre histonas y ADN

A

1 metilación

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14
Q

aumenta atracción entre ADN e histonas

A

2 a 3 metilaciones

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15
Q

ambas reducen atracción entre ADN e histonas

A

acetilaciones y fosforilaciones

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16
Q

partes del nucléolo

A

masa granular
centro fibrilar
componente denso fibrilar

17
Q

zona en la que se condesa ADN
precursores de rRNA

A

nucléolo

18
Q

esqueleto
organización de loops
ancla proteínas, cromatina y heterocromatina

A

matriz nuclear