nucleo. Flashcards

1
Q

composición del núcleo:

A

1.Envoltura nuclear
2. uno o más nucleolos
3. nucleoplasma

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2
Q

Núcleo:

A

-Delimitado por envoltura nuclear.
-Contiene información genética (ADN, CROMATINA, CROMOSOMAS)

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3
Q

El núcleo es:

A

Centro administrativo, de control e información de la célula

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4
Q

¿que almacena el nucleo?

A

El material genético, ademas regula su expresion

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5
Q

Poro nuclear

A

8 NUCLEOPORINAS (30 tipos)
felalanina-glicina impiden el paso de macromoléculas.

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6
Q

Envoltura nuclear

A

Límite entre el citoplasma y el núcleo.
2 bicapas, regula el tráfico molecular y contiene poros nucleares

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7
Q

¿Como se decide que entra y sale del núcleo?

A

Por la señal de localización

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8
Q

Importina:

A

METE. - Ensamblaje y maduración de ribosomas
-factores de transcripción y replicación.

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9
Q

Exportina:

A

SACA. Subunidades ribosomales
ARNm, ARNt, factores de transcripción.

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10
Q

Empaquetamiento del nucleo

A

Histonas

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11
Q

RANGTP

A

exportinas, cargas nucleares HACIA EL CITOPLASMA

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12
Q

RANGDP

A

Importinas, cargas del citoplasma HACIA el nucleo

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13
Q

Cromatina

A

ADN + proteinas asociadas

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14
Q

Eucromatina

A

menos compactada (LA ACTIVA)

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15
Q

Heterocromatina

A

menos compactada (LA MENOS ACTIVA)

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16
Q

dos formas de división de la heterocromatina:

A

Constitutiva: siempre compactada
Facultativa: Estuvo activa alguna vez