Vim li cas thiaj muaj kev lag luam thiab kev ua lag luam?
Vim li cas thiaj muaj kev lag luam thiab kev ua lag luam?

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Video: Vim li cas thiaj muaj kev lag luam thiab kev ua lag luam?
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Ua thawj thiab lagging strands

coli, DNA polymerase uas tswj feem ntau ntawm cov synthesis yog DNA polymerase III. Qhov no txoj hlua yog ua tsis tu ncua, vim hais tias cov DNA polymerase yog txav mus rau tib txoj kev raws li lub replication diav rawg. Qhov no tsis tu ncua synthesized txoj hlua yog hu ua coj txoj hlua.

Tsis tas li lo lus nug yog, dab tsi yog cov thawj coj thiab lagging strands?

Thaum replication pib, ob niam txiv DNA strands sib cais. Ib tug ntawm no yog hu ua tus coj txoj hlua , thiab nws yog replicated tsis tu ncua nyob rau hauv lub 3' mus rau 5' kev taw qhia. Lwm tus txoj hlua yog cov lagging strand , thiab nws yog replicated discontinuously nyob rau hauv luv luv seem.

Ib yam li ntawd, vim li cas Okazaki fragments tsim rau ntawm txoj hlua lagging? Okazaki fragments yog tsim nyog vim cov lagging strand tsis tuaj yeem raug synthesized ncaj qha mus rau replication diav rawg yam tsis tau tsim nyob rau hauv tawg tawg tsim los ntawm primase thiab polymerase III hauv prokaryotes lossis polymerase delta / epsilon hauv eukaryotes. Cov fragments yog ces kaw nrog ligase.

Tsis tas li ntawd, yog vim li cas 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.

Dab tsi yog lub ntsiab lus ntawm kev coj strand?

Strand ntawm DNA tau replicated tsis tu ncua. Hauv DNA replication, lub txoj hlua uas yog ua nyob rau hauv lub 5 'mus rau 3' kev taw qhia los ntawm nruam polymerization ntawm lub 3 'loj taub hau.

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