Yuav ua li cas ua ntej ntawm txhua lub hauv paus chiv keeb ntawm replication?
Yuav ua li cas ua ntej ntawm txhua lub hauv paus chiv keeb ntawm replication?

Video: Yuav ua li cas ua ntej ntawm txhua lub hauv paus chiv keeb ntawm replication?

Video: Yuav ua li cas ua ntej ntawm txhua lub hauv paus chiv keeb ntawm replication?
Video: Npau Suav li no Txhob coj mus tham qhia luag lwm tus 2024, Kaum ib hlis
Anonim

Teb: Keeb kwm ntawm replication yog qhov chaw/ib ntu hauv cov genome ntawm cov kab mob los ntawm qhov chaw ntawm DNA rov ua dua pib. Ntawm ua ntej , ob strands sib cais uas yog unwinding ntawm ob helix tshwm sim nrog kev pab ntawm ib qho enzyme hu ua helicase ntawm qhov chaw no ( keeb kwm los yog rov ua dua ).

Nyob rau hauv no hais txog, yuav ua li cas tshwm sim nyob rau hauv lub keeb kwm ntawm replication?

Cov keeb kwm ntawm replication (tseem hu ua replication keeb kwm ) yog ib ntus hauv ib lub genome uas rov ua dua pib. Qhov no tuaj yeem koom nrog rov ua dua ntawm DNA hauv cov kab mob muaj sia xws li prokaryotes thiab eukaryotes, lossis DNA lossis RNA hauv cov kab mob, xws li cov kab mob RNA ob npaug.

Ib yam li ntawd, vim li cas cov kab mob tsuas muaj ib lub hauv paus ntawm kev rov ua dua tshiab? Prokaryotic chromosomes muaj ib lub hauv paus ntawm replication , thaum eukaryotic chromosomes muaj ntau keeb kwm . Qhov no yog vim eukaryotic chromosomes loj dua, ntau ntau keeb kwm xav tau rov ua dua tag nrho cov chromosome nyob rau hauv ib lub sij hawm luv luv. Eukaryoticchromosomes yog linear.

Ua kom pom qhov no, qhov twg DNA replication pib?

Hauv ib lub cell, DNA replication pib ntawm specifications, los yog keeb kwm ntawm rov ua dua , nyob rau hauv lub genome. Unwinding ntawm DNA nyob rau hauv keeb kwm thiab synthesis ntawm cov strands tshiab, haum los ntawm ib tug enzyme hu ua helicase, ua rau rov ua dua forks loj hlob bi-directionally los ntawm theorigin.

Dab tsi yog lub luag haujlwm ntawm ob lub DNA qub hauv kev rov ua dua?

Kev piav qhia: Thaum lub sij hawm rov ua dua , DNAstrands sib cais los ntawm ib leeg los ntawm helicase enzyme. Cov no ob cais strands ua raws li tus qauv txoj hlua . Cov tawg me me ntawm DNA yog hu ua Okazaki fragments. Cov DNA polymerase ntxiv nucleotides tshiab thiab nws tau pib los ntawm RNA primase hauv cov qauv strands.

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