Video: Dab tsi yog lagging strand synthesis?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Cov lagging strand yog ua ke luv luv, cais ntu. Nyob rau lagging strand template, primase "nyeem" tus qauv DNA thiab pib synthesis ntawm luv luv complementary RNA primer. Cov RNA primers raug tshem tawm thiab hloov nrog DNA, thiab cov seem ntawm DNA tau koom ua ke los ntawm DNA ligase.
Ib yam li ntawd, tej zaum koj yuav nug, vim li cas cov synthesis ntawm lub lagging strand tsis txuas ntxiv?
Nyob rau sab sauv lagging strand , synthesis yog tsis tu ncua , txij li RNA primers tshiab yuav tsum tau ntxiv raws li qhib ntawm replication diav rawg txuas ntxiv nthuav tawm cov qauv tshiab. Qhov no ua rau cov khoom tawg ntawm Okazaki tawg.
Tsis tas li ntawd, vim li cas thiaj li lagging strand tshwm sim? Cov lagging strand yog hu ua lagging strand vim hais tias muaj kev ncua loj heev nyob rau hauv replication ntawm qhov ntawd txoj hlua txheeb ze tus thawj coj txoj hlua . Ntawd yog, nws txhais tau tias "lags" tom qab tus thawj coj txoj hlua nyob rau hauv chav kawm ntawm dsDNA replication.
Hauv qhov no, dab tsi yog qhov lag luam strand thiab vim li cas nws tshwm sim?
Cov lag lub sijhawm ntawd tshwm sim thaum DNA yog unwinding piav nws lub npe, lagging strand . Thaum DNA txaus tsis muaj qhov txhab, lwm polymerase yuav tuaj rau hauv thiab rov ua dua lwm qhov me me ntawm lub lagging strand . Cov chunks ntawm DNA no hu ua Okazaki fragments. Thaum kawg, lawv txhua tus koom ua ke hauv ib qho yooj yim txoj hlua ntawm DNA.
Qhov twg strand yog nruam?
Okazaki Fragments. Nyob rau hauv lub replication diav rawg, ob leeg strands yog synthesized nyob rau hauv ib tug 5' → 3' kev taw qhia. Tus thawj txoj hlua yog synthesized tsis tu ncua , hos lub lagging txoj hlua yog synthesized nyob rau hauv luv luv pieces hu ua Okazaki fragments.
Pom zoo:
Dab tsi yog cov qauv thiab coding strand ntawm DNA?
Ib strand ntawm DNA tuav cov ntaub ntawv uas codes rau ntau yam noob; cov strand no feem ntau hu ua template strand los yog antisense strand (muaj anticodons). Lwm qhov, thiab ntxiv, strand yog hu ua coding strand lossis kev nkag siab strand (muaj codons)
Dab tsi yog ib nrab ntawm DNA strand hu ua?
Yog li ntawd, DNA replication yog hu ua semiconservative. Lub sij hawm semiconservative yog hais txog qhov tseeb hais tias ib nrab ntawm cov thawj molecule (ib qho ntawm ob strands nyob rau hauv ob lub helix) yog "tshem" nyob rau hauv lub tshiab molecule
Txhua 3 tsab ntawv ntawm DNA strand code yog dab tsi?
Cov no yog cov 'cov tsiaj ntawv' ntawm cov tsiaj ntawv uas yog siv los sau cov 'code lo lus'. Cov kab mob caj ces muaj cov kab ke ntawm peb tsab ntawv 'cov lus' (qee zaum hu ua 'triplelets', qee zaum hu ua 'codons'), sau ib qho tom qab ntawm qhov ntev ntawm DNA strand. Tag nrho lwm cov sequences code rau cov amino acids tshwj xeeb
Yog vim li cas cov thawj thiab lagging strand replicated txawv?
Vim yog qhov kev taw qhia tsis sib xws ntawm ob lub chromosomal DNA strands, ib qho strand (ua strand) yog replicated nyob rau hauv ib tug feem ntau processive yam, thaum lwm yam (lagging strand) yog synthesized nyob rau hauv luv luv seem hu ua Okazaki fragments
Lub npe ntawm cov enzyme uas catalyzes ntawm cov synthesis ntawm mRNA Strand yog dab tsi?
MRNA yog "tus tub txib" RNA. mRNA yog synthesized nyob rau hauv lub nucleus siv cov nucleotide ib theem zuj zus ntawm DNA ua ib tug template. Cov txheej txheem no yuav tsum muaj nucleotide triphosphates ua substrates thiab yog catalyzed los ntawm enzyme RNA polymerase II. Tus txheej txheem ntawm kev ua mRNA los ntawm DNA yog hu ua transcription, thiab nws tshwm sim nyob rau hauv lub nucleus