Cov txheej txheem:
- Puas tsuas yog prokaryotic mRNAs yog polyadenylated ntawm 3 kawg?
- Qhov twg mRNA tsis yog polyadenylated?
- Puas splicing tshwm sim ua ntej polyadenylation?
- Muaj mRNA sib txawv tuaj yeem tsim los ntawm tib lub noob?
Video: Puas yog tag nrho cov tsiaj nyeg mrnas spliced thiab polyadenylated?
2024 Tus sau: Fiona Howard | [email protected]. Kawg hloov kho: 2024-01-10 06:38
Ntawm mRNAs, poly(A) tus Tsov tus tw tiv thaiv mRNA molecule los ntawm enzymatic degradation nyob rau hauv cytoplasm thiab pab nyob rau hauv transcription termination, export ntawm mRNA los ntawm lub nucleus, thiab kev txhais lus. Yuav luag tag nrho eukaryotic mRNAs yog polyadenylated, tshwj tsis yog tsiaj replication-dependent histone mRNAs.
Puas tsuas yog prokaryotic mRNAs yog polyadenylated ntawm 3 kawg?
Lub 3 '-kawg ntawm ob qho tib si prokaryotic thiab eukaryotic mRNA yog polyadenylated, tab sis cov poly(A) tracts ntawm prokaryotic mRNA feem ntau luv, xws li ntawm 15 mus rau 60 adenylate residues. thiab koom nrog tsuas yog 2-60% ntawm cov molecules ntawm ib hom mRNA.
Qhov twg mRNA tsis yog polyadenylated?
The mRNAs uas encode feem ntau ntawm cov proteins histone hauv metazoans, replication-dependent histone mRNAs, tsuas yog paub eukaryotic cellular mRNAs uas tsis yog polyadenylated, thiab ntxiv rau., introns yeej tsis pom nyob rau hauv cov histone mRNAs.
Puas splicing tshwm sim ua ntej polyadenylation?
Rau cov ntawv sau luv luv, RNA splicing feem ntau ua raws li kev sib cais thiab polyadenylation ntawm 3′ kawg ntawm thawj cov ntawv sau tseg. Tab sis rau ntev transcription units uas muaj ntau exons, splicing ntawm exons nyob rau hauv nascent RNA feem ntau pib ua ntej transcription ntawm cov noob tiav
Muaj mRNA sib txawv tuaj yeem tsim los ntawm tib lub noob?
Txawm li cas los xij, kev sib txuas tso cai rau cov txheej txheem hu ua lwm txoj kev sib txuas, uas ntau tshaj ib mRNA tuaj yeem tsim los ntawm tib lub noob. … Qhov no ua rau peb mRNA mRNAs paub tab, txhua tus uas txhais ua cov protein nrog cov qauv sib txawv.
Pom zoo:
Qhov twg yog tag nrho cov qauv thiab lub koom haum ntawm cov suab paj nruag?
Lub sij hawm suab paj nruag daim ntawv suab paj nruag Hauv suab paj nruag, daim ntawv hais txog cov qauv ntawm cov suab paj nruag los yog kev ua yeeb yam … Cov suab paj nruag nthuav tawm lub sijhawm dhau los ntawm kev nthuav dav thiab kev loj hlob ntawm cov tswv yim no.
Qhov twg yog tag nrho lossis tag nrho?
Koj yuav tsum siv tag nrho nrog cov neeg Asmeskas feem ntau, thiab tag nrho nrog cov neeg tuaj saib Askiv feem ntau. … Ib yam li cov nroog no muaj ob npaug L thiab yog Askiv, tag nrho muaj ob npaug L thiab yog Askiv . txhais tau tias tag nrho?
Nyob rau hauv kev sib raug zoo ntawm tus tsiaj nyeg tsiaj uas kab mob twg tau txais txiaj ntsig?
Kev ua phem yog thaum cov kab mob predator pub rau lwm yam kab mob los yog kab mob, hu ua prey. Tus tsiaj nyeg ib txwm txo qis tus neeg raug tsim txomNws ua qhov no los ntawm kev ua kom cov tsiaj tsis muaj sia nyob, rov tsim dua, lossis ob qho tib si.
Puas yog waterbuck muaj cov tsiaj nyeg?
Waterbuck feem ntau nkag mus rau hauv dej kom khiav tawm ntawm cov tsiaj nyeg uas suav nrog lions, tsov txaij, cheetahs, African qus dev thiab Nile crocodiles (leopards thiab pom hyenas prey ntawm juveniles) . Dab tsi tsiaj noj dej? Predators.
Puas yog megalodon muaj cov tsiaj nyeg?
megalodons paub tab yuav tsis muaj cov tsiaj nyeg, tab sis cov neeg yug tshiab thiab cov menyuam yaus tej zaum yuav muaj kev cuam tshuam rau lwm cov tsiaj txhu loj, xws li cov hammerhead sharks (Sphyrna mokarran), uas nws thaj tsam thiab chaw zov me nyuam tau xav tias tau sib tshooj nrog cov megalodon los ntawm qhov kawg ntawm Miocene thiab … Tus tsiaj twg tua tau megalodon?
