Compactación del DNA. Flashcards

1
Q

Pasos de la compactación del DNA.

A
  • DNA.
  • Fibra de nucleosomas.
  • Fibra solenoide.
  • Espiral de bucles de solenoide.
  • Cromosoma.
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2
Q

Las histonas son proteínas de carga +/-

A

Positiva.

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3
Q

Se asocian para formar octámero de histonas.

A

Dos moléculas de histona H2A, H2B, H3 y H4.

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4
Q

Son histonas:

A

H1, H2A, H2B, H3, H4.

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5
Q

Segmento de ADN se enrolla dando 1.7 vueltas al octámero para formar un …

A

nucleosoma.

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6
Q

Fragmentos de ADN se asocian a diversos octámeros formando …

A

una cadena de “cuentas de rosario” o “cuentas de collar”.

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7
Q

Función del nucleosoma.

A

Condesar el DNA.

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8
Q

Nucleosomas se compactan para formar polinucleosoma (6 unidades).

A

Solenoide.

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9
Q

Forma una hebra (cromatina).

A

Solenoide.

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10
Q

Cromatina transcripcional activa (poco condensada).

A

Eucromatina.

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11
Q

Cromatina transcripcional inactiva (más condensada).

A

Heterocromatina.

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