Video: Dab tsi yog qhov tsos ntawm chromatin?
2024 Tus sau: Michael Samuels | [email protected]. Kawg hloov kho: 2023-12-16 01:44
Txhua DNA strand qhwv ib ncig ntawm pawg me me ntawm cov protein molecules hu ua histones, tsim cov qauv ntawm cov hlaws zoo li, hu ua nucleosomes, txuas nrog DNA strand (raws li qhia hauv daim duab 1). Hauv qab lub tshuab tsom iav, tsis muaj qhov txwv chromatin muaj ib tug "beads ntawm ib txoj hlua" tsos.
Tsis tas li ntawd, chromatin yog dab tsi thiab nws cov qauv yog dab tsi?
Chromatin yog ib qho nyuaj ntawm macromolecules tsim los ntawm DNA, RNA, thiab protein, uas tau pom sab hauv cov nucleus ntawm eukaryotic cells. Cov thawj cov protein tivthaiv ntawm chromatin yog histones uas pab npaj DNA rau hauv "zoo li hlaws" cov qauv hu ua nucleosomes los ntawm kev muab lub hauv paus rau qhov twg cov DNA tuaj yeem qhwv ib ncig.
nyob rau theem twg koj tuaj yeem pom chromatin? prophase
Tom qab ntawd, puas yog chromatin pom thaum tsuas?
raws li DNA yog complex nrog ntau thiab ntau histone (thiab lwm yam proteins) nws yuav nruj nreem ntim. Tsuas yog ua ntej kev faib xov tooj ntawm tes, cov kab mob me me ntawm DNA thiab keeb kwm tuaj yeem yog ua qias neeg nrog cov xim dyes, ua rau lawv pom nyob rau hauv lub teeb tsom tsom.
Ob hom chromatin yog dab tsi?
Chromatin muaj nyob rau hauv ob daim ntawv . Ib daim ntawv, hu ua euchromatin, tsawg dua thiab tuaj yeem sau tau. Daim ntawv thib ob, hu ua heterochromatin, tau muab tso ua ke ntau thiab feem ntau tsis sau. Nyob rau hauv lub microscope nyob rau hauv nws daim ntawv txuas ntxiv, chromatin zoo li cov hlaws dai ntawm txoj hlua.
Pom zoo:
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