Video: Qhov kev txiav txim ntawm helicase tsim dab tsi?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Teb thiab piav qhia: Lub kev ua ntawm helicase tsim ib tug replication diav rawg. Helicase yog lub luag hauj lwm rau 'unzipping' ob-helix DNA strand, thiab ib tug replication diav rawg yog tus
Dhau li ntawm no, dab tsi yog lub luag haujlwm ntawm helicase?
Helicase tshem tawm DNA. Helicases yog cov enzymes uas khi thiab tuaj yeem hloov kho nucleic acid lossis nucleic acid protein complexes. Muaj DNA thiab RNA helicases . DNA helicases Nws yog ib qho tseem ceeb thaum lub sij hawm DNA replication vim hais tias lawv cais ob-stranded DNA mus rau hauv ib tug strands cia txhua strand yuav luam.
Tsis tas li ntawd, helicase yog dab tsi? Helicases yog molecular motor proteins uas muaj nyob rau hauv cov kab mob, kab mob, thiab eukaryotes [1, 2]. Lawv siv cov tshuaj lom neeg lub zog ntawm ATP hydrolysis los ua kom muaj zog ruaj khov hydrogen kev sib txuas ntawm duplex DNA. Los ntawm kev ua li ntawd, helicases tso cai rau kev nkag mus rau cov ntaub ntawv caj ces kaw hauv duplex DNA.
Tsis tas li ntawd, kev ua haujlwm ntawm helicase hauv DNA replication quizlet yog dab tsi?
Lawv lub luag haujlwm tseem ceeb yog kom ruaj khov ntawm ob DNA strands ib zaug helicase cais niam txiv strand. Qhov no enzymes muaj nuj nqi yog rov qab mus tom qab lub lagging strand yog duplicated thiab kaw tej yam so nyob rau hauv lub bonds, koom lub Okazaki fragments nyob rau hauv lub lagging strand, thiab ua lwm yam tsim nyog kho.
Yuav ua li cas thaum DNA unzips?
Thawj kauj ruam hauv DNA replication yog cais los yog unzip ob txoj hlua ntawm ob lub helix. Lub enzyme uas tswj hwm qhov no yog hu ua helicase (vim nws unwinds lub helix). Thaum cov strands sib cais, ib qho enzyme hu ua DNA polymerase luam tawm txhua strand siv txoj cai hauv paus-pairing.
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