2024 Tus sau: Elizabeth Oswald | [email protected]. Kawg hloov kho: 2024-01-13 00:07
Thaum lub sijhawm interphase (1), chromatin yog nyob rau hauv nws qhov tsawg kawg nkaus condensed lub xeev thiab zoo li xoob faib thoob plaws hauv lub nucleus. Chromatin condensation pib thaum prophase (2) thiab chromosomes pom. Chromosomes tseem condensed thoob plaws hauv ntau theem ntawm mitosis (2-5).
Dab tsi yog condensed chromatin?
Chromatin yog ib qho nyuaj ntawm DNA thiab cov proteins uas forms chromosomes nyob rau hauv lub nucleus ntawm eukaryotic hlwb. Nuclear DNA tsis tshwm sim hauv cov kab dawb dawb; nws yog condensed heev thiab qhwv ib ncig ntawm cov proteins ntawm nuclear thiaj li haum rau hauv lub nucleus. Chromatin muaj nyob rau hauv ob hom.
Puas yog condensed chromatin active?
Nws yog feem ntau ntseeg tias silent chromatin yog condensedthiab transcriptionally active chromatin yog decondensed. Txawm li cas los xij, me ntsis paub txog kev sib raug zoo ntawm qib condensation thiab gene qhia.
Lub cev condensed ntawm chromatin yog dab tsi?
Euchromatin yog daim ntawv me me ntawm chromatin, whereas heterochromatinyog hais txog daim ntawv condensed. Euchromatin thiab heterochromatin yog cov ua haujlwm thiab cov qauv sib txawv, thiab muaj lub luag haujlwm tseem ceeb hauv kev hloov pauv thiab kev qhia ntawm cov noob.
piv txwv ntawm chromatin yog dab tsi?
Piv txwv li, spermatozoa thiab avian cov qe ntshav liab muaj cov chromatin nruj dua li cov hlwb eukaryotic feem ntau, thiab trypanosomatid protozoa tsis condense lawv.chromatin rau hauv pom chromosomes txhua. … Cov qauv hauv zos ntawm chromatin thaum lub sij hawm interphase nyob ntawm cov noob tshwj xeeb uas muaj nyob hauv DNA.
Pom zoo:
Thaum cev xeeb tub thaum ntxov thaum lub cramping nres?
Lossis qee tus poj niam hnov ntxhiab zoo li plooj lossis stabbing mob ntawm ib lossis ob sab ntawm lawv lub plab. Cov mob yuav tuaj thiab mus. Feem ntau, qhov mob ntawm plab mob thaum cev xeeb tub yog me me, thiab ploj mus thaum koj hloov koj txoj haujlwm, pw tsaug zog, lossis mus rau chav dej.
Chromatin tsim li cas?
A nucleosome muaj 147 lub hauv paus khub DNA uas tau qhwv ib ncig ntawm 8 histones hu ua octomer. Lub nucleosome tuaj yeem muab quav ntxiv los tsim cov chromatin fiber. Chromatin fibers yog coiled thiab condensed los ua chromosomes. Chromatin ua li cas?
Thaum rho tawm cov hlau cov ore yog ci yog tias nws yog?
Nyob rau hauv roasting, cov ore los yog ore concentrate yog kho nrog cua kub heev. Cov txheej txheem no feem ntau yog siv rau cov zaub mov sulfide. Thaum lub sij hawm ci, cov sulfide hloov mus rau an oxide, thiab sulfur yog tso tawm raws li sulfur dioxide, roj.
Lub sijhawm ntsiag to ntawm chromatin uas cov amino acids yog methylated?
Histones tuaj yeem ua methylated ntawm lysine (K) thiab arginine (R) residuesnkaus xwb, tab sis methylation feem ntau pom ntawm lysine residues ntawm histone tails H3 thiab H4. Tus Tsov tus tw kawg tshaj plaws ntawm lub nucleosome core yog N-terminal (cov seem raug suav txij li qhov kawg no).
Thaum chromatin condenses nws daim ntawv?
Thaum lub sijhawm prophase, qhov nyuaj ntawm DNA thiab cov proteins muaj nyob hauv cov nucleus, hu ua chromatin, condenses. Cov chromatin coils thiab dhau los ua compact, ua rau tsim ntawm pom chromosomes. condensed chromatin daim ntawv yog dab tsi?
