Video: Yuav ua li cas koj sau DNA sequences?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Nws suav nrog kev luam cov gene DNA sequence los ua ib qho RNA molecule. Kev sau ntawv yog ua los ntawm cov enzymes hu ua RNA polymerases, uas txuas nucleotides los ua ib qho RNA strand (siv cov DNA strand raws li ib tug template). Kev sau ntawv muaj peb theem: pib, elongation, thiab termination.
Tib neeg kuj nug, koj ua li cas sau thiab txhais cov DNA ib ntus?
- Kauj ruam 1: DNA transcription. Siv cov hlua ntawm cov DNA uas tau muab ua ntu zus thiab muab tso rau hauv tus xa xov RNA los ntawm kev hloov A nrog U, T nrog A, G nrog C thiab C nrog G. Qhov tshwm sim mRNA yuav tsum tau pub dawb rau DNA.
- Kauj Ruam 2: Kev txhais DNA. tRNA nyeem cov ntaub ntawv caj ces hauv mRNA hauv daim ntawv ntawm codon.
Tsis tas li ntawd, dab tsi mRNA tau sau los ntawm txhua qhov DNA? Thaum kev sau ntawv , enzyme RNA polymerase (ntsuab) siv DNA raws li ib tug template los tsim ib tug pre- mRNA cov ntaub ntawv (pink). Lub pre- mRNA yog txheej txheem los ua kom paub tab mRNA molecule uas tuaj yeem txhais los tsim cov protein molecule (polypeptide) encoded los ntawm cov noob caj noob ces.
Ua li no, DNA strand twg yog siv rau kev sau ntawv?
Kev siv cov ntawv sau ib qho ntawm ob qhov nthuav tawm DNA strands raws li tus qauv; qhov no txoj hlua hu ua template txoj hlua . Cov khoom RNA yog ntxiv rau cov qauv txoj hlua thiab yuav luag zoo tib yam rau lwm tus DNA strand , hu ua nontemplate (los yog coding) txoj hlua.
Dab tsi yog kev txhais lus hauv DNA?
Kev txhais lus yog tus txheej txheem uas siv cov ntaub ntawv dhau los ntawm DNA raws li tus tub txib RNA thiab hloov nws mus rau hauv cov amino acids ua ke nrog peptide bonds. Lub ribosome yog qhov chaw ntawm qhov kev ua no, ib yam li RNA polymerase yog qhov chaw ntawm mRNA synthesis.
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