Kev txiav tawm kev txiav tawm tshwm sim hauv cov tshuaj tiv thaiv ua ke rau RNA 3'-kawg ua haujlwmFeem ntau eukaryotic mRNA precursors raug cleaved hauv ib qhov chaw tshwj xeeb hauv cheeb tsam 3′-tsis tau txhais, ua raws. los ntawm polyadenylation ntawm cov khoom ntws cleavage. Cov protein ntau tau koom nrog hauv cov tshuaj tiv thaiv no.
Kev txhais lus nres li cas?
Kev txiav tawm
RNA polymerase yuav khaws cov ntawv sau kom txog thaum nws tau txais cov cim kom nres. Cov txheej txheem ntawm kev xaus lus yog hu ua kev txiav tawm, thiab nws tshwm sim thaum lub polymerase transcribes ib theem ntawm DNA hu ua terminator.
qhov txiaj ntsig ntawm kev txhais lus kawg nyob qhov twg?
Qhov tshwm sim ntawm Kev Tshaj Tawm yog a kev pub dawb ntawm messengerRNA (mRNA).
qhov kawg ntawm kev sau ntawv pib li cas?
Kev txhais ntawm ob lub noob. (a) RNA polymerase txav los ntawm 3′ kawg ntawm tus qauv strand, tsim RNA strand uas loj hlob hauv 5′ → 3′ kev taw qhia (vim tias nws yuav tsum yog antiparallel rau cov qauv strand).
Lub teeb liab nres yog dab tsi?
Rho-independent terminator Ib chav kawm ntawm cov teeb liab nres rau DNA transcription. Kev ncab ntawm DNA uas muaj cov kab ke uas tau rov ua dua nyob rau hauv qhov kev taw qhia rov qab thiab ua raws li txoj hlua luv ntawm adenines. Thaum theej rau hauv RNA, nws tsim ib lub voj plaub hau uas ua lub teeb liab kom tsis txhob muaj cov ntawv sau tseg.
