Video: Dab tsi yog nucleosome muaj?
2024 Tus sau: Michael Samuels | [email protected]. Kawg hloov kho: 2023-12-16 01:44
Cov DNA me me tshaj plaws yog hu ua a cov nucleosome thiab nws yog tsim los ntawm DNA thiab protein. Cov protein feem yog ua los ntawm cov khoom me me hu ua histones. Cov ntsiab lus tseem ceeb yog ua los ntawm plaub hom histones (H2A, H2B, H3, thiab H4). DNA qhwv ib puag ncig ntawm cov tub ntxhais.
Ua qhov no hauv kev txiav txim siab, dab tsi yog nucleosome suav nrog?
A nucleosome yog yooj yim rov ua dua chav tsev ntawm eukaryotic chromatin. Nyob rau hauv tib neeg lub cell, txog li rau ko taw ntawm DNA yuav tsum tau ntim rau hauv lub nucleus uas muaj txoj kab uas hla tsawg dua tib neeg cov plaub hau. Ib leeg xwb nucleosome muaj kwv yees li 150 lub hauv paus khub ntawm DNA ua ntu zus nyob ib puag ncig ntawm cov keeb ntawm cov protein.
nrhiav nucleosome nyob qhov twg? Cov cov nucleosome yog qhov tsawg tshaj plaws cov qauv ntawm chromatin, thiab yog tsim los ntawm kev sib cuam tshuam ntawm DNA thiab histone proteins. Ntawm no, histone octamer tau tsim los ntawm keeb kwm H2A, H2B, H3 thiab H4, txawm hais tias qee zaum lwm qhov kev hloov pauv keeb kwm kuj tseem yuav yog pom hauv cov tub ntxhais (piv txwv li, H2A. Z, MacroH2A, H2a.
Hais txog qhov no, pes tsawg nucleosomes nyob hauv chromosome?
Yog li ntawd, txhua chromosome muaj ntau pua txhiab tus nucleosomes , thiab cov no nucleosomes tau koom nrog los ntawm DNA uas khiav nruab nrab ntawm lawv (qhov nruab nrab ntawm kwv yees li 20 khub hauv paus).
Dab tsi ntawm cov hauv qab no yog cov yam ntxwv ntawm nucleosomes?
Nucleosomes pab txhawb rau ntim DNA. Nucleosomes nyob rau hauv chromatin yog teem nyob rau hauv ncaj, sab-los-sab chains. Nucleosomes muaj txog 10000 Angstroms nyob rau hauv txoj kab uas hla. Histones muaj cov tails uas tawm thiab tuaj yeem hloov kho, cuam tshuam rau DNA qhia.
Pom zoo:
Yuav muaj dab tsi tshwm sim yog tias koj tau kuaj pom muaj mob fibromyalgia?
Syndrome yog ib pab pawg ntawm cov tsos mob uas tshwm sim ua ke. Cov neeg uas muaj fibromyalgia tau hnov mob thiab mob thoob plaws lub cev, qaug zog (nkees heev uas tsis tau zoo dua thaum pw lossis so), thiab teeb meem pw tsaug zog. Fibromyalgia tej zaum yuav tshwm sim los ntawm teeb meem hauv lub paj hlwb nrog rau lub paj hlwb thiab qhov hnov mob
Yuav muaj dab tsi tshwm sim yog tias koj muaj tus kab mob HPV thiab tus mob npaws?
Herpes ua rau mob ib ncig lossis hauv qhov ncauj thiab ntawm qhov chaw mos. Tsis zoo li tus mob khaub thuas, HPV feem ntau tsis muaj tsos mob, tab sis feem ntau yog qhov ua rau mob qog noj ntshav. HPV tuaj yeem ua rau mob qog noj ntshav, ua rau nws sib cav tias yog qhov txaus ntshai tshaj plaws ntawm ob STDs. Ob leeg kis tau los ntawm kev sib deev, tab sis HPV kuj tseem tuaj yeem sib qhia yooj yim los ntawm tawv nqaij-rau-tawv nqaij
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Tsis pub dhau ntu ua ntej yog ob qhov chaw ua kua dej: chav nyob sab hauv nruab nrab ntawm lub ntsej muag tom qab ntawm lub qhov muag (piv txwv li lub qhov muag lub qhov muag) thiab lub qhov muag. posterior chamber nruab nrab ntawm iris thiab lub ntsej muag pem hauv ntej ntawm vitreous
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Lub luag haujlwm ntawm nucleosome yog dab tsi?
Nucleosomes yog chav ntim khoom yooj yim ntawm DNA ua los ntawm cov protein keeb nyob ib puag ncig uas DNA tau coiled. Lawv ua raws li lub scaffold rau kev tsim cov txheej txheem chromatin ntau dua ntxiv rau txheej txheej ntawm kev tswj hwm kev qhia noob