Nucleo Flashcards

1
Q

funciones principales

A

almacena y protege ADN
sintetizar ARN

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2
Q

2 partes de la envoltura nuclear

A

tiene 2 capas lipídicas llamadas membrana interna y externa

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3
Q

que contiene la mebrana externa

A

ribosomas que traducen el ARN

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4
Q

que contiene la membrana interna

A

proteínas de anclaje para el ARN

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5
Q

Que proteina conforma al poro nuclear

A

nucleoporina

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6
Q

que es cromatina

A

uniones de histonas con el ADN para compactarlo

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7
Q

de que se conforma el nucleosoma

A

8 histonas y da 1.8 vueltas

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8
Q

grado de compactación después de la cromatina

A

fibra de 30 nm

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9
Q

grado de compactación después de la fibra

A

loops

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10
Q

grado de compactación más compleja

A

cromosoma

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11
Q

aminoácidos de la histona

A

lisina

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12
Q

modificaciones de la histona

A

metilación
acetilación
fosforilación
ubiquitinación

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13
Q

describe la acetilación

A

adición de acetilo a lisinas
soltar las vueltas de ADN

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14
Q

describe la metilación

A

adición de grupos metilo en arginina o lisina
reduce o aumenta atracción

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15
Q

fosforilación

A

adición de fosfato

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16
Q

que es heterocromatina

A

luego de la división, quedan residuos de ADN compactado anclados a la membrana nuclear

17
Q

que es eucromatina

A

ADN descompactado

18
Q

3 componentes del nucleolo

A

granular
denso fibrilar
centro fibrilar