Video: Nws txhais li cas los txwv DNA?
2024 Tus sau: Stanley Ellington | [email protected]. Kawg hloov kho: 2023-12-16 00:17
Ib qho kev txwv enzyme, txwv endonuclease, lossis restrictase yog ib qho enzyme uas cleaves DNA rau hauv cov khoom tawg ntawm lossis ze rau qhov chaw paub tshwj xeeb hauv cov molecules hu ua qhov chaw txwv. Cov enzymes no yog pom nyob rau hauv cov kab mob thiab archaea thiab muab ib tug tiv thaiv mechanism tiv thaiv invading kab mob.
Ib yam li ntawd, nws tau nug, qhov kev tshem tawm DNA txhais li cas?
Kev txwv enzyme: Ib qho enzyme los ntawm cov kab mob uas tuaj yeem paub txog cov txheej txheem hauv paus hauv DNA thiab txiav cov DNA ntawm qhov chaw ntawd (qhov chaw txwv). Kuj hu ua kev txwv endonuclease. Ib qho kev txwv enzyme yog cov protein uas tsim los ntawm cov kab mob uas tshem DNA ntawm qhov chaw tshwj xeeb.
Tsis tas li ntawd, vim li cas cov enzymes txwv tsis pub txiav lawv tus kheej DNA? Cov kab mob muaj txwv enzymes , kuj hu ua txwv endonucleases , uas txiav ob txoj hlua DNA ntawm cov ntsiab lus tshwj xeeb rau hauv cov khoom tawg. Txaus siab heev, txwv enzymes tsis txhob hlais lawv tus kheej DNA . Kab mob tiv thaiv lawv tus kheej DNA los ntawm chop down txwv enzyme los ntawm methylation txwv qhov chaw.
Tsis tas li ntawd, qhov txwv enzyme ua li cas rau DNA?
Kev txwv enzyme , kuj hu ua txwv endonuclease, ib qho protein uas tsim los ntawm cov kab mob uas cleaves DNA ntawm qhov chaw tshwj xeeb raws cov molecule. Nyob rau hauv cov kab mob cell, txwv enzymes cais txawv teb chaws DNA , yog li tshem tawm cov kab mob.
Dab tsi yog txwv enzyme thiab nws hom?
Kev piav qhia. Muaj plaub chav kawm ntawm txwv endonucleases: hom I, II, III, IV. Txhua hom ntawm cov enzymes paub txog cov DNA luv luv thiab ua tiav qhov endonucleolytic cleavage ntawm DNA kom muab cov khoom tshwj xeeb ob-stranded fragments nrog davhlau ya nyob twg 5'-phosphates.
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