Cov txheej txheem:

Muaj pes tsawg lub hauv paus ntev npaum li cas yog DNA ntawm ib lub cell?
Muaj pes tsawg lub hauv paus ntev npaum li cas yog DNA ntawm ib lub cell?

Video: Muaj pes tsawg lub hauv paus ntev npaum li cas yog DNA ntawm ib lub cell?

Video: Muaj pes tsawg lub hauv paus ntev npaum li cas yog DNA ntawm ib lub cell?
Video: Tshuaj theem vim li cas thiaj tau nqi ?/ Siv kho mob dab tsi?/paris polyphylla use for? 2024, Kaum ib hlis
Anonim

Qhov no tso cai rau cov 3 billion lub hauv paus khub hauv txhua lub xov tooj kom haum rau hauv qhov chaw tsuas yog 6 microns thoob plaws. Yog tias koj ncab DNA nyob rau hauv ib lub xovtooj ntawm txhua txoj kev tawm, nws yuav ntev li 2m thiab tag nrho cov DNA hauv koj lub hlwb muab tso ua ke yuav yog li ob npaug ntawm txoj kab uas hla ntawm lub Hnub Ci.

Ua li no, ntau npaum li cas DNA nyob hauv ib lub cell?

Feem ntau hlwb nyob rau hauv lub cev (somatic hlwb ) yog diploid, nrog 23 khub ntawm chromosomes. Cov 23 khub ntawm chromosomes tuav tag nrho txog 6 billion puag khub ntawm DNA rau cell.

Tsis tas li ntawd, ntau npaum li cas yog qhov yuam kev hauv DNA replication? Nws Nws yog kwv yees tias replicate eukaryotic DNA polymerases ua yuam kev kwv yees li ib zaug txhua 104 – 105 nucleotides polymerized [58, 59]. Yog li, txhua lub sij hawm ib tug diploid mammalian cell replicates, tsawg kawg yog 100,000 thiab mus txog 1,000,000 polymerase yuam kev tshwm sim.

DNA ntev npaum li cas nucleotides?

Yog xav paub ntxiv txog lub cev ntawm tib neeg genome, saib Tshooj 1.2. Lub genome nuclear muaj kwv yees li 3 200 000 000 nucleotides ntawm DNA, muab faib ua 24 linear molecules, luv tshaj 50 000 000 nucleotides nyob rau hauv ntev thiab ntev tshaj plaws 260 000 000 nucleotides , txhua tus muaj nyob rau hauv ib qho sib txawv chromosome.

Dab tsi yog 3 feem ntawm DNA nucleotide?

Ob leeg deoxyribonucleic acid (DNA) thiab ribonucleic acid (RNA) yog tsim los ntawm nucleotides uas muaj peb ntu:

  • Nitrogenous Base. Purines thiab pyrimidines yog ob pawg ntawm nitrogenous hauv paus.
  • Pentos Qab Zib. Hauv DNA, cov piam thaj yog 2'-deoxyribose.
  • Phosphate Group. Ib pawg phosphate yog PO43-.

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