Video: Yuav kho DNA puas tau li cas?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Feem ntau kev puas tsuaj rau DNA yog kho los ntawm kev tshem tawm ntawm puas lawm bases ua raws li resynthesis ntawm thaj av excised. Qee qhov mob hauv DNA Txawm li cas los xij, tuaj yeem ua tau kho los ntawm direct reversal ntawm lub kev puas tsuaj , uas tej zaum yuav yog ib tug ntau npaum li cas ntawm kev soj ntsuam nrog tej yam DNA puas uas tshwm sim ntau zaus.
Ib yam li ntawd, tib neeg nug, yuav ua li cas thaum DNA puas lawm?
Cov DNA nyob rau hauv ib qho ntawm koj lub hlwb tau txais puas lawm kaum tawm txhiab zaus hauv ib hnub. Vim DNA muab cov qauv qhia rau cov proteins uas koj lub hlwb xav tau ua haujlwm, qhov no kev puas tsuaj tuaj yeem ua rau muaj teeb meem loj-xws li mob qog noj ntshav. Hmoov zoo, koj lub hlwb muaj txoj hauv kev kho feem ntau ntawm cov teeb meem no, feem ntau ntawm lub sijhawm.
Ib yam li ntawd, cov hlwb puas tuaj yeem kho tau? Zoo li Apollo 13, a cell puas tsis tuaj yeem tso siab rau leej twg los kho nws. Nws yuav tsum kho Nws tus kheej, ua ntej los ntawm kev tso tseg qhov poob ntawm cytoplasm, thiab tom qab ntawd rov tsim dua los ntawm kev tsim kho cov txheej txheem uas tau tsim. puas lawm los yog poob. To taub lawv li cas kho thiab rov tsim dua lawv tus kheej ua tau qhia kev kho mob rau tej yam kev mob uas muaj cellular puas.
Ua li no, puas tuaj yeem kho DNA kho nws tus kheej?
Tam sim ntawd tom qab DNA synthesis, lwm yam mispaired bases ua tau raug kuaj pom thiab hloov pauv hauv cov txheej txheem hu ua kho tsis sib haum . Yog DNA tau puas lawm , nws ua tau yuav kho los ntawm ntau yam mechanisms, nrog rau cov tshuaj reversal, excision kho , thiab ob-stranded so kho.
Vim li cas DNA kho qhov tseem ceeb?
kho DNA ua kom muaj sia nyob ntawm ib hom los ntawm kev ua kom niam txiv DNA kom tau txais kev ncaj ncees raws li qhov ua tau los ntawm cov xeeb ntxwv. Nws kuj khaws kev noj qab haus huv ntawm ib tug neeg. Kev hloov pauv hauv cov txheej txheem caj ces tuaj yeem ua rau mob qog noj ntshav thiab lwm yam kab mob caj ces.
Pom zoo:
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Thaum lub sij hawm kev loj hlob, feem ntau muaj sia nyob mus txog ib lub voj voog ntawm kev hloov hu ua kev loj hlob. Cov khoom muaj sia tau txais lub zog los ntawm lawv ib puag ncig thiab siv lub zog ntawd los loj hlob, tsim kho, thiab tsim tawm. Txhua yam kab mob xav tau lub zog los tsim cov tshuaj uas ua rau lawv lub hlwb