Video: Dab tsi yog qhov zoo tshaj thiab silencers?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Txhim kho muaj nuj nqi raws li "tig rau" hloov hauv cov noob qhia thiab yuav qhib qhov chaw txhawb nqa ntawm ib lub noob thaum cov neeg nyob ntsiag to ua raws li qhov "tig" hloov. Txawm hais tias ob txoj cai tswjfwm no ua haujlwm tawm tsam ib leeg, ob hom kab ke cuam tshuam rau thaj tsam txhawb nqa hauv txoj hauv kev zoo sib xws.
Ib yam li ntawd ib tug yuav nug, dab tsi ua li cas txhim kho hauv DNA?
Hauv genetics, ib ua kom zoo yog luv (50-1500 bp) cheeb tsam ntawm DNA uas ua tau ua ke nrog cov protein ( cov activators ) txhawm rau ua kom qhov muaj feem cuam tshuam ntawm ib qho gene yuav tshwm sim. Cov proteins no feem ntau raug xa mus rau qhov kev hloov pauv. Txhim kho yog cis-acting.
Kuj Paub, yuav ua li cas txhim kho kev ua haujlwm? Txhim kho cov cheeb tsam yog kev sib txuas ua ke, los yog qhov chaw, rau qhov kev hloov pauv. Thaum DNA-bending protein khi rau ib qho ua kom zoo , cov duab ntawm DNA hloov. Txhim kho : Ib ua kom zoo yog DNA ib ntus uas txhawb nqa kev hloov pauv. Txhua ua kom zoo yog tsim los ntawm luv DNA sequences hu ua distal tswj ntsiab.
Hais txog qhov no, qhov twg silencers khi?
Silencers yog tswj thaj tsam ntawm DNA uas, zoo li kev txhim kho, tuaj yeem nyob ntau txhiab tus khub hauv paus deb ntawm cov noob uas lawv tswj. Txawm li cas los xij, thaum cov ntaub ntawv hloov pauv khi rau lawv, kev qhia ntawm cov noob uas lawv tswj tau raug tsim txom.
Dab tsi yog qhov kev ua kom zoo dua qub?
Txhim kho cov kab ke yog regulatory DNA ua ntu zus uas, thaum khi los ntawm cov proteins tshwj xeeb hu ua cov khoom hloov pauv, txhim kho qhov kev hloov pauv ntawm cov noob caj noob ces.
Pom zoo:
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