Nws xav tias yuav pab nrog mRNA paub los ntawm ribosome thaum txhais lus. Kev hloov kho kuj tseem siv qhov chaw ntawm qhov kawg ntawm RNA cov ntawv sau tseg. Txog 3' kawg ntawm RNA saw 30-500 adenines ntxiv rau hauv qhov hu ua poly A tail.
qhov hloov pauv hloov pauv hloov pauv nyob qhov twg?
Post-transcriptional modifications of pre-mRNA, xws li capping, splicing, thiab polyadenylation, coj qhov chaw hauv nucleus. Tom qab cov kev hloov kho no tau ua tiav lawm, cov mRNA mRNA uas paub tab yuav tsum tau hloov mus rau hauv cytoplasm, qhov twg protein synthesis tshwm sim.
Qhov twg hauv qab no yog vim li cas rau kev hloov pauv hloov pauv ntawm mRNA?
Polyadenylation tshwm sim hauv cov nucleus tom qab hloov pauv ntawm mRNA. Pab mRNA thauj tawm ntawm lub nucleus mus rau cytoplasm. Stabilizing mRNAs hauv cytoplasm kom lawv tuaj yeem ua cov lus rau kev txhais lus ntev dua. Txhawb qhov ua tau zoo ntawm thawj kauj ruam ntawm kev txhais lus.
Qhov twg ntawm kev hloov pauv hloov pauv tshwm sim thaum lub sijhawm tRNA tsim?
Transfer RNAs (tRNAs) yog qhov tseem ceeb rau kev tsim cov protein. … Kwv yees li 20% ntawm cov poov xab tRNAs yog encoded los ntawm intron-muaj cov noob. Peb-kauj ruam splicing txheej txheem kom tshem tawm cov introns xav tsis thoob tshwm sim hauv cytoplasm hauv cov poov xab thiab txhua qhov sib txuas enzymes zoo li lub hli hauv kev ua haujlwm.ntxiv rau tRNA splicing.
Lub sijhawm twg theem twg splicing ntawm RNA tshwm sim?
Splices tshwm sim nyob rau hauv lub nucleus ua ntej RNA migrate mus rau cytoplasm. Thaum splicing tiav, mRNA paub tab (muaj cov ntaub ntawv tsis cuam tshuam nrog coding), raug thauj mus rau cytoplasm qhov twg ribosomes txhais cov mRNA rau hauv cov protein. Cov ntawv sau ua ntej mRNA muaj ob qho tib si introns thiab exons.
