Nyob rau hauv ob qho tib si, replication tshwm sim sai heev vim ntau yam polymerases tuaj yeem ua ke ob txoj hlua tshiab nyob rau tib lub sijhawm los ntawm kev siv txhua qhov tsis muaj kab mob los ntawm thawj DNA ob chav helix ua tus qauv. Ib tug ntawm cov thawj strands yog hu ua tus thawj strand, where the other is called the lagging strand.
DNA hu ua dab tsi?
Lub ob lub helix yog ib qho kev piav qhia ntawm cov duab molecular ntawm ob-stranded DNA molecule. Xyoo 1953, Francis Crick thiab James Watson tau piav qhia txog cov qauv molecular ntawm DNA, uas lawv hu ua "ob chav helix," hauv phau ntawv journal Nature.
DNA hu ua dab tsi?
Kom haum rau hauv cov hlwb, DNA yog coiled nruj nreem tsim cov qauv hu ua chromosomes. Txhua chromosome muaj ib qho DNA molecule. Tib neeg muaj 23 khub ntawm chromosomes, uas pom nyob rau hauv txhua lub cell lub nucleus.
YPuas yog chromosome ib leeg ntawm DNA?
Txhua tus chromosome muaj ib zaug ob zaug ntawm DNA nrog rau cov khoom ntim tau hais tseg. … Daim ntawv condensed no yog kwv yees li 10,000 lub sij hawm luv dua li cov kab DNA strand yog tias nws tsis muaj cov proteins thiab rub taut.
YPuas yog ib leeg-stranded DNA lossis RNA?
Tsis zoo li ob-kab DNA, RNA yog ib leeg-stranded moleculehauv ntau yam ntawm nws txoj haujlwm lom neeg thiab muaj ntau txoj hlua luv ntawm nucleotides. Txawm li cas los xij, ib qho RNA molecule tuaj yeem, los ntawm kev sib koom ua ke ua ke, tsim intrastrand ob helixes, xws li hauv tRNA.
