Video: DNA hu ua dab tsi thaum complex nrog cov protein?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
DNA thaum nyuaj nrog protein ntau yog hu ua . chromatin. Chromatin nyob rau hauv nws daim ntawv condensed yog hu ua . chromosomes.
Ib yam li ntawd, DNA proteins ua dab tsi hauv chromatin thiab chromosomes?
Chromatin yog ib yam khoom hauv ib chromosome suav nrog DNA thiab protein ntau . Cov DNA nqa lub xovtooj ntawm cov lus qhia genetic. Qhov loj cov proteins hauv chromatin yog histones, uas pab pob cov DNA nyob rau hauv ib daim ntawv compact uas haum nyob rau hauv lub cell nucleus.
Qhov thib ob, DNA ua chromosome li cas? Nyob rau hauv lub nucleus ntawm txhua cell, lub DNA molecule yog ntim rau hauv xov zoo li cov qauv hu ua chromosomes . Txhua chromosome yog ua los ntawm DNA nruj nreem coiled ntau zaus nyob ib ncig ntawm cov proteins hu ua histones uas txhawb nws cov qauv. DNA thiab histone proteins tau ntim rau hauv cov qauv hu ua chromosomes.
Kuj tseem paub, nws hu ua dab tsi thaum chromosomes tshwm?
Hauv cov hlwb, chromatin feem ntau folds rau hauv cov yam ntxwv tsim hu ua chromosomes . Thaum lub sij hawm interphase (1), chromatin yog nyob rau hauv nws tsawg condensed xeev thiab tshwm loosely faib thoob plaws hauv lub nucleus. Chromatin condensation pib thaum lub sij hawm prophase (2) thiab chromosomes pom.
Vim li cas DNA qhwv nruj heev hauv chromosomes?
Qhov thib ob helix ntawm DNA yog ces qhwv nyob ib ncig ntawm qee cov proteins hu ua histones. Qhov no tso cai rau cov DNA kom ntau kaw ntom nti thiab yog li ntawd siv qhov chaw tsawg dua hauv lub cell. Qhov no txawm tighter winding ntawm lub DNA ua rau kev tsim ntawm kaw ntom nti , los yog condensed, chromosomes.
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