Video: Vim li cas histones thiab DNA khi ua ke?
2024 Tus sau: Michael Samuels | [email protected]. Kawg hloov kho: 2023-12-16 01:44
DNA raug them tsis zoo, vim yog pawg phosphate hauv nws cov phosphate-sugar backbone, yog li histones khi nrog DNA nruj heev. Cov no yog cov proteins uas muaj txiaj ntsig zoo uas ua rau muaj kev cuam tshuam tsis zoo DNA thiab tsim cov complexes hu ua nucleosomes.
Tib neeg tseem nug, dab tsi ua rau DNA qhwv ib puag ncig keeb kwm?
Cov DNA yuav qhwv nws tus kheej ib ncig a histone vim tus nqi zoo (Kuv xav tias ntawm DNA ) thiab tus nqi tsis zoo ntawm a keeb kwm . Feem ntau lawv ntim DNA kom nruj kom nws tsis tuaj yeem siv rau kev sib txuas ntawm cov protein. Zoo qhov keeb kwm tso cai tsim cov chromatids uas (thaum lub sij hawm mitosis) tsim chromosomes.
lub hom phiaj ntawm methyl molecules hauv keeb kwm thiab DNA cuam tshuam yog dab tsi? Methyl molecules khi rau DNA thiab thaiv kev nkag mus rau noob. • Acetyl molecules khi rau keeb kwm thiab txhim kho kev nkag mus rau cov noob.
Dhau li ntawm no, dab tsi yog kev sib raug zoo ntawm DNA thiab histones?
Histones yog cov protein yooj yim, thiab lawv cov nqi zoo tso cai rau lawv koom nrog DNA , uas yog negatively them. Ib txhia histones ua haujlwm li spools rau cov xov zoo li DNA los qhwv ib ncig. Hauv qab lub tshuab tsom iav hauv nws daim ntawv nthuav dav, chromatin zoo li cov hlaws dai ntawm txoj hlua. Cov hlaws yog hu ua nucleosomes.
Cov histones ua haujlwm li cas?
Hauv biology, keeb kwm yog cov protein ntau alkaline pom nyob rau hauv eukaryotic cell nuclei uas pob thiab xaj DNA rau hauv cov qauv hu ua nucleosomes . Lawv yog cov tseem ceeb ntawm cov protein ntawm chromatin, ua raws li cov kab ke ntawm cov DNA cua, thiab ua lub luag haujlwm hauv kev tswj cov noob.
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