Vim li cas DNA khaws cia hauv chromosomes hauv eukaryotes?
Vim li cas DNA khaws cia hauv chromosomes hauv eukaryotes?

Video: Vim li cas DNA khaws cia hauv chromosomes hauv eukaryotes?

Video: Vim li cas DNA khaws cia hauv chromosomes hauv eukaryotes?
Video: khwv nyiaj tsis nce tes yog vim li cas 2024, Kaum ib hlis
Anonim

Cov txheej txheem zoo heev khaws cov ntaub ntawv caj ces hauv cov kab mob uas muaj sia nyob. Nyob rau hauv sib piv, nyob rau hauv eukaryotes , tag nrho cov cell chromosomes yog khaws cia nyob rau hauv ib tug qauv hu ua lub nucleus. Txhua eukaryotic chromosome yog tsim los ntawm DNA coiled thiab condensed nyob ib ncig ntawm nuclear proteins hu ua histones.

Hauv qhov no, DNA tsim chromosomes hauv eukaryotic hlwb li cas?

Piav Yuav ua li cas DNA tsim chromosomes hauv eukaryotic hlwb . DNA coils ncig histones rau daim ntawv nucleosomes, uas coil rau daim ntawv chromatin fibers. Cov chromatin fibers supercoil rau tsim chromosomes , uas yog pom nyob rau hauv mitosis. Ib txoj hlua ntawm DNA ua hauj lwm raws li ib tug template los ua kom haum strand.

Ib yam li ntawd, puas yog DNA ib txwm khaws cia hauv chromosomes? DNA khaws cia hauv chromosomes Lub cell nucleus yog lub organelle tseem ceeb tshaj plaws, thiab nws nyob ntawm no uas peb pom peb DNA (deoxyribonucleic acid) tau ntim nruj rau hauv cov qauv hu ua chromosomes . Chromosomes yog cov xov ntev zoo li cov qauv ua los ntawm ib DNA molecule thiab protein. Tib neeg lub hlwb muaj 23 khub ntawm chromosomes.

Kuj nug, vim li cas DNA khaws cia ua chromosomes hauv cell?

Txhawm rau khaws cov khoom tseem ceeb no, DNA molecules yog nruj nreem ntim ib ncig ntawm cov proteins hu ua histones los ua cov qauv hu ua chromosomes . Cov DNA uas muaj koj cov noob yog khaws cia hauv koj hlwb nyob rau hauv ib tug qauv hu ua lub nucleus.

Puas yog eukaryotic hlwb muaj chromosomes?

Tag nrho DNA hauv a cell tuaj yeem pom nyob rau hauv tus kheej daim ntawv hu ua chromosomes . Eukaryotic hlwb muaj ntau chromosomes uas undergo meiosis thiab mitosis thaum lub sij hawm cell faib, thaum feem ntau prokaryotic hlwb muaj tsuas yog ib ncig chromosome.

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