Yuav ua li cas tshwm sim thaum lub sij hawm replication?
Yuav ua li cas tshwm sim thaum lub sij hawm replication?

Video: Yuav ua li cas tshwm sim thaum lub sij hawm replication?

Video: Yuav ua li cas tshwm sim thaum lub sij hawm replication?
Video: Yuav ua li cas thiaj ua tau neeg zoo 2024, Kaum ib hlis
Anonim

Rov ua dua yog cov txheej txheem los ntawm qhov uas ob-stranded DNA molecule yog theej los tsim ob lub DNA zoo tib yam molecules. DNA rov ua dua yog ib qho tseem ceeb tshaj plaws txheej txheem uas tshwm sim hauv ib lub cell. Yuav kom ua tiav qhov no, txhua txoj hlua ntawm DNA uas twb muaj lawm ua tus qauv rau rov ua dua.

Tsis tas li ntawd, 4 kauj ruam ntawm kev rov ua dua yog dab tsi?

  • Kauj ruam 1: Replication Fork Formation. Ua ntej DNA tuaj yeem rov ua dua, ob chav stranded molecule yuav tsum tau "unzipped" rau hauv ob qho tib si.
  • Kauj ruam 2: Primer Binding. Txoj kev ua thawj coj yog qhov yooj yim tshaj plaws los rov ua dua.
  • Kauj Ruam 3: Elongation.
  • Kauj Ruam 4: Tshem tawm.

Tom qab, lo lus nug yog, qhov twg replication tshwm sim? DNA replication tshwm sim nyob rau hauv lub cytoplasm ntawm prokaryotes thiab nyob rau hauv lub nucleus ntawm eukaryotes. Txawm nyob qhov twg DNA replication tshwm sim , cov txheej txheem hauv paus yog tib yam.

Hauv qhov no, qhov twg yog thawj kauj ruam tshwm sim thaum lub sijhawm rov ua dua?

Cov thawj kauj ruam hauv DNA rov ua dua yog kom 'unzip' ob-helix qauv ntawm DNA molecule. Qhov no yog ua los ntawm ib qho enzyme hu ua helicase uas rhuav cov hydrogen bonds tuav lub hauv paus ntawm DNA ua ke (A nrog T, C nrog G).

Dab tsi yog 3 kauj ruam ntawm DNA replication?

Cov kab ke ntawm cov hauv paus encodes cov ntaub ntawv genetic. Peb kauj ruam hauv qhov txheej txheem DNA replication yog pib, elongation thiab kev txiav txim.

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