pib DNA replication, unwinding enzymes hu ua DNA helicasesua rau ob niam txiv DNA strands kom unwind thiab sib cais los ntawm ib leeg ntawm lub hauv paus chiv keeb ntawm replication los ua ob "Y-zoo li tus. " replication forks.
Dab tsi ua rau DNA qhib?
Kev piav qhia: Helicasesyog cov enzymes koom nrog hauv kev tshem tawm ntawm ob txoj kab ke DNA molecule thaum pib ntawm DNA replication. Lawv ua li ntawd los ntawm kev khi ntawm DNA cov sequences hu ua keeb kwm ntawm DNA molecule ces lawv rhuav cov hydrogen bonds ntawm complementary base khub ua rau ob strands ntawm DNA molecule unzip.
Vim li cas DNA thiaj li yuav tsum qhib qhov nruab nrab thaum rov ua dua?
Tus qauv ntawm DNA qiv nws tus kheej yooj yim rau DNA rov ua dua. Txhua sab ntawm ob lub helix runs in opposite (anti-parallel) cov lus qhia. Qhov zoo nkauj ntawm cov qauv no yog tias nws tuaj yeem qhib qhov nruab nrab thiab txhua sab tuaj yeem ua tus qauv lossis qauv rau sab nraud (hu ua semi-conservative replication).
Yuav ua li cas yog lub luag haujlwm rau unzipping DNA helix?
Nyob zoo . Key enzyme koom nrog hauv DNA replication, nws yog lub luag haujlwm rau 'unzipping' ob chav helix qauv los ntawm kev rhuav tshem cov hydrogen bonds ntawm cov hauv paus ntawm cov lus sib txawv ntawm DNA molecule.
Dab tsi ua rau DNA qhib thaum rov ua dua?
Lub DNA helix yog qhib los ntawm DNA polymerase molecule clamped rau ntawm txoj hlua, ua yeeb yam nrog ib lossis ntau dua DNA helicase molecules khiav raws cov strands pem hauv ntej ntawm nws. Helix qhib yog pab los ntawm kev sib koom tes ua ke ntawm ib leeg-strand DNA-binding protein
