Dab tsi enzyme proofreads thiab kho DNA?
Dab tsi enzyme proofreads thiab kho DNA?

Video: Dab tsi enzyme proofreads thiab kho DNA?

Video: Dab tsi enzyme proofreads thiab kho DNA?
Video: Vitamin B15 yog dab tsi thiab zoo dab tsi 17 Aug 2019 2024, Kaum ib hlis
Anonim

DNA yog threaded ib txhij tsim ib tug tshiab strand ntawm DNA thiab proofreads nws ua hauj lwm. Kev ua pov thawj muaj feem ntau ntawm cov enzymes ntawm replication complex, tab sis DNA polymerase III plays tej zaum lub luag haujlwm tseem ceeb tshaj plaws.

Ib yam li ntawd, tib neeg nug, uas enzyme proofreads DNA replicated?

DNA polymerases

Ib yam li ntawd, DNA kho enzymes yog dab tsi? DNA kho enzymes . Txhais. DNA kho enzymes yog cov enzymes uas paub thiab kho lub cev kev puas tsuaj hauv DNA , tshwm sim los ntawm raug hluav taws xob, UV teeb los yog reactive oxygen hom. Kev kho ntawm DNA puas alleviates poob ntawm cov ntaub ntawv genetic, tiam ntawm ob-strand so, thiab DNA crosslinkages.

Ib tug kuj yuav nug, dab tsi pov thawj DNA rau kev ua yuam kev?

Feem ntau ntawm yuam kev thaum DNA replication yog kho tam sim ntawd los ntawm DNA polymerase uas proofreads lub hauv paus uas nyuam qhuav tau ntxiv. Lub polymerase xyuas seb lub hauv paus tshiab ntxiv tau ua ke nrog lub hauv paus hauv cov qauv strand. Yog tias nws yog lub hauv paus raug, cov nucleotide tom ntej yog ntxiv.

Dab tsi yog DNA puas thiab kho?

kho DNA yog ib qho kev sau ntawm cov txheej txheem uas ib lub xov tooj txheeb xyuas thiab kho kev puas tsuaj mus rau DNA molecules uas encode nws genome. Lwm cov kab mob ua rau muaj teeb meem kev hloov pauv hauv lub xov tooj ntawm tes genome, uas cuam tshuam rau kev ciaj sia ntawm nws cov ntxhais cell tom qab nws raug mitosis.

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