Cov txheej txheem:
Video: Muaj pes tsawg lub hauv paus ntev npaum li cas yog DNA ntawm ib lub cell?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
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-.
Pom zoo:
Muaj pes tsawg lub hauv paus zoo tuaj yeem muaj qhov sib npaug?
Ib txoj hauv kev los txiav txim siab qhov siab tshaj plaws ntawm qhov zoo thiab qhov tsis zoo ntawm cov hauv paus ntsiab lus ntawm polynomial. Txij li thaum muaj peb qhov kev hloov pauv, muaj qhov siab tshaj plaws ntawm peb lub hauv paus zoo
Muaj pes tsawg guanine bases puas yog 50 lub hauv paus khub ob txoj hlua DNA 100 bases tag nrho muaj yog tias nws muaj 25 adenine bases?
Yog li, muaj tag nrho ntawm 25 + 25 = 50 adenine thiab thymine hauv tag nrho. Qhov ntawd tawm 100− 50 = 50 seem hauv paus. Nco ntsoov tias cytosine thiab guanine daim ntawv cog lus nrog ib leeg, thiab yog li lawv sib npaug ntawm cov nyiaj. Tam sim no peb tuaj yeem faib los ntawm 2 kom tau txais tus lej ntawm guanine lossis cytosine hauv paus
Muaj pes tsawg lub vertices ib lub hauv paus puas Heptagonal prism muaj?
Teb thiab piav qhia: Lub heptagonal prism muaj 14 vertices. Ib tug heptagonal prism yog ib tug prism nyob rau hauv uas lub hauv paus yog heptagons, los yog polygons nrog xya sab thiab xya vertices
Muaj pes tsawg lub tangents hauv lub voj voog uas sib tshuam hauv ob lub ntsiab lus muaj?
Thaum ib lub voj voog nyob tag nrho hauv ib leeg yam tsis tau kov, tsis muaj tangent. Thaum ob lub voj voog kov ib leeg sab hauv 1 cov tangent tuaj yeem kos rau lub voj voog. Thaum ob lub voj voog sib tshuam hauv ob lub ntsiab lus tiag tiag thiab sib txawv, 2 cov tangents tuaj yeem kos rau lub voj voog
Muaj pes tsawg hom tshuaj lom neeg muaj pes tsawg leeg?
Hauv chaw ua haujlwm muaj ob hom kev phom sij: kev noj qab haus huv thiab kev phom sij ntawm lub cev