Cov txheej txheem:

Yuav ua li cas thaum lub sij hawm tsim ntawm Okazaki fragments?
Yuav ua li cas thaum lub sij hawm tsim ntawm Okazaki fragments?

Video: Yuav ua li cas thaum lub sij hawm tsim ntawm Okazaki fragments?

Video: Yuav ua li cas thaum lub sij hawm tsim ntawm Okazaki fragments?
Video: Lub neej tsis muaj 3 hnub zoo 9/19/2017 2024, Kaum ib hlis
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Tsim ntawm Okazaki Fragments

Okazaki fragments yog tsim raws li lub lagging strand ntawm DNA yog theej. Ob chav helix yog qhib rau cov txheej txheem ntawm replication los ntawm DNA helicase. DNA helicase yog ib qho enzyme uas rhuav cov hydrogen bonds uas tuav cov DNA nyob rau hauv ob chav helix qauv

Khaws qhov no hauv kev txiav txim siab, Okazaki fragments tsim li cas?

Okazaki fragments daim ntawv vim lub lagging strand uas yog tsim yuav tsum yog tsim nyob rau hauv ntu ntawm 100-200 nucleotides. Qhov no yog ua tiav DNA polymerase ua me me RNA primers raws li lagging strand uas yog ua qeeb qeeb ntau dua li cov txheej txheem ntawm DNA synthesis ntawm cov strand.

Tsis tas li ntawd, cov haujlwm ntawm Okazaki tawg yog dab tsi? Okazaki fragment Function: Lub tsev thaiv rau DNA synthesis ntawm lub lagging strand. Ntawm ib qho qauv strand, DNA polymerase synthesizes DNA tshiab nyob rau hauv ib qho kev taw qhia deb ntawm replication diav rawg kev txav mus los.

Yog li ntawd, Okazaki fragments tsim nyob qhov twg?

Okazaki fragments yog tsim nyob rau hauv lub lagging strand kom DNA tuaj yeem ua ke nyob rau hauv qhov tseem ceeb 5' mus rau 3' yam ntawm lub lagging strand.

Vim li cas Okazaki fragments tsim nyob rau hauv DNA replication?

Cov okazaki fragments tsim thaum rov ua dua enables cov rov ua dua ntawm 3'5' (lagging strand). Lawv yog luv sequences ntawm DNA nucleotides tshiab synthesize ntawm lub lagging strand. Primase generates luv luv strands ntawm RNA uas khi rau cov coj strand ntawm lub DNA pib rov ua dua.

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