TRANSCRIPCIÓN Flashcards

1
Q

pb q desenrolla el ARNpol

A

12 a 20

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2
Q

ARN pol en eubacterias

A

un solo tipo sintetiza ARNt , ARNr y ARNm

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3
Q

subunidad alfa ARNpol ll

A

2 de 40KDa, ensamblaje , reconocimiento del promotor, une algunos activadores

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4
Q

centro catalitico del ARNpol ll

A

beta y beta prima

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5
Q
A
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6
Q

ARN pol de eubacterias

A

una sola holoenzima para sintesis de ARNt ARNm y ARNr

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7
Q

subunidades alfa

A

encargadas de reconocimiento a promotor, 40KDa cada una, une algunos activadores

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8
Q

subunidades beta y beta prima

A

zona catalitica

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9
Q

subunidad beta

A

155KDa

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10
Q

beta prima

A

160KDa

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11
Q

subunidad que se libera al termino de la iniciación, evitando que enzima quede adherida al promotor

A
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12
Q

el ARN pol ll densenrrolla….pb , formando la burbuja de transcripción

A

12 a 20 pb

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13
Q

secuencia consenso de promotor

A
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14
Q

consenso -10

A

TATAAT

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15
Q

consenso -35

A

TTGACA

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16
Q

terminación de la transcripción

A

Rho…
formacion de tallo burbuja, hairpin?

17
Q

Rho

A

secuencia 50 a 90 bases corriente arriba del terminador rica en C y pobres en G

18
Q

tiempo de vida ARNm procarionte

A

2 minutos

19
Q

ARNm procarionte

A

5000 bases 180KDa

20
Q

enhanser

A

pueden modificar trancripción, son distales al promotor (100pb)

21
Q

Promotores ARN pol I

A

core y UCE, factores (UBF1 y SL1)

22
Q

Promotores ARN pol Ill

A

TFIIIA, TFIIIB, TFIIIC

23
Q

TATA box

A

8pb (-25 -30 eu

24
Q

TFIID

A

reconoce parte inicial del promotor

25
Q

Caja Prinow

A

: tetranucleótido rico en AT.

26
Q
A