2024 Tus sau: Elizabeth Oswald | [email protected]. Kawg hloov kho: 2024-01-13 00:07
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.
Pom zoo:
Thaum kev sib hloov pauv hloov pauv tshwm sim li cas?
Inter-generational mobility tshwm sim thaum kev sib raug zoo hloov ntawm ib tiam mus rau lwm tus. Qhov kev hloov pauv tuaj yeem yog nce lossis nqis. Piv txwv li, leej txiv ua hauj lwm hauv lub hoobkas thaum nws tus tub tau txais kev kawm uas tso cai rau nws los ua kws lij choj lossis kws kho mob.
Qhov kev hloov pauv no puas yuav ua rau muaj kev hloov pauv hloov pauv?
Yog li, yog tias muaj kev hloov pauv, piv txwv li, kev ntxig lossis tshem tawm ntawm nucleotide, tshwm sim, qhov no tuaj yeem ua rau kev hloov pauv ntawm kev nyeem ntawv. Nws hloov tag nrho cov amino acid ib ntus. Cov kev hloov pauv no yog hu ua frameshift mutation (tseem hu ua kev nyeem ntawv hloov pauv, nyeem ntawv hloov pauv, lossis framing yuam kev).
Qhov twg yog qhov kev hloov pauv hloov pauv hloov pauv?
Semiconservative replication piav qhia txog cov txheej txheem ntawm DNA replication nyob rau hauv tag nrho cov paub hlwb. DNA replication tshwm sim ntawm ntau lub hauv paus pib ntawm kev rov ua dua raws DNA qauv strand. Raws li DNA ob chav helix yog unwound by helicase, replication tshwm sim nyias ntawm txhua tus qauv strand nyob rau hauv antiparallel cov lus qhia.
Qhov kev hloov pauv twg yog xav tias yuav cuam tshuam los ntawm kev hloov pauv hloov pauv?
Dependent Variable Qhov sib txawv uas nyob ntawm lwm yam uas ntsuas. Cov kev hloov pauv no yuav tsum tau hloov pauv raws li qhov kev sim ua haujlwm ntawm tus kheej hloov pauv lossis hloov pauv. Nws yog cov nyhuv presumed. Qhov kev tshawb fawb hloov pauv twg yog qhov tshwm sim?
Thaum twg qhov kev hloov pauv hloov pauv tau tshwm sim?
Kev Tawm Tsam Kev Hloov Kho tau tshwm sim nyob rau lub sijhawm kwv yees tib lub sijhawm li Protestant Reformation, tiag tiag (raws li qee qhov chaw) pib sai sai ua ntej Martin Luther qhov kev txiav txim siab ntawm Ninety-tsib Cov Lus Qhia rau lub qhov rooj ntawm Tsev fuabtais Tsev fuabtais hauv1517.
