Yuav ua li cas yuav tsum tshwm sim rau transcription ntawm lac operon?
Yuav ua li cas yuav tsum tshwm sim rau transcription ntawm lac operon?

Video: Yuav ua li cas yuav tsum tshwm sim rau transcription ntawm lac operon?

Video: Yuav ua li cas yuav tsum tshwm sim rau transcription ntawm lac operon?
Video: Vim li cas tus ntseeg hos yuav tsum raug kev sim siab 2024, Kaum ib hlis
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Qhov twg hauv qab no yuav tsum tshwm sim rau transcription ntawm lac operon gene rau coj qhov chaw ? Cov protein repressor khi rau DNA molecule, thiab RNA polymerase poob. Lactose raug tshem tawm ntawm qhov system. Lub repressor protein poob tawm ntawm DNA molecule, thiab RNA polymerase khi rau tus txhawb nqa.

Cov lus nug tseem yog, dab tsi yog tus qauv lac operon siv los ua qauv qhia?

Cov lac operon ua yog ib ua haujlwm , los yog pab pawg ntawm cov noob nrog ib tus neeg txhawb nqa (tau sau ua ib qho mRNA). Cov noob nyob rau hauv ua haujlwm encode proteins uas tso cai rau cov kab mob siv lactose raws li lub zog qhov chaw.

Kuj Paub, dab tsi ua rau lub lac operon? Cov ua Operon : Ib Inducer Operaon . Cov lac operon ua yog inducible ua haujlwm uas siv lactose raws li lub zog qhov chaw thiab yog qhib thaum cov piam thaj tsawg thiab lactose yog tam sim no.

Tom qab ntawd, ib tus tuaj yeem nug, dab tsi yog qhov kev hloov pauv dav dav thiab lawv ua haujlwm li cas?

A transcription factor yog ib qho protein uas khi rau DNA ib ntus (txhim kho lossis txhawb nqa), ib leeg lossis nrog lwm cov proteins hauv qhov nyuaj, rau tswj tus nqi ntawm kev sau ntawv cov ntaub ntawv genetic los ntawm DNA rau neeg xa xov liaison RNA los ntawm kev txhawb nqa (ua haujlwm ua haujlwm) lossis thaiv (ua haujlwm raws li tus neeg tawm tsam)

Dab tsi yog peb cov txheej txheem los ntawm cov txheej txheem kev hloov pauv uas tswj hwm eukaryotic noob qhia?

Txawm li cas los xij, tsis zoo li cov hlwb prokaryotic, cov eukaryotic tshuaj RNA polymerase xav tau lwm cov proteins, lossis cov ntsiab lus ntawm kev txhais lus , kom yooj yim kev sau ntawv pib. Transcription yam yog cov proteins uas khi rau qhov kev txhawb nqa ib ntus thiab lwm yam kev tswj hwm kom tswj tau kev sau ntawv ntawm lub hom phiaj noob.

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