Stop codon code yog dab tsi?
Stop codon code yog dab tsi?

Video: Stop codon code yog dab tsi?

Video: Stop codon code yog dab tsi?
Video: Poj ntsuam tsis thooj poj nrauj tsis yog. 11/2/2017 2024, Kaum ib hlis
Anonim

Hauv caj ces code , a nres codon (los yog kev txiav txim codon ) yog ib qho nucleotide triplet hauv tub txib RNA uas signals a kev txiav txim kev txhais lus rau hauv cov protein. Feem ntau codons hauv tub txib RNA (los ntawm DNA) sib raug mus rau qhov sib ntxiv ntawm cov amino acid mus rau ib tug loj hlob polypeptide saw, uas tej zaum yuav kawg ua ib tug protein.

Ib yam li ntawd, qhov nres codon hauv DNA yog dab tsi?

Nres codons yog sequences DNA thiab RNA uas yuav tsum tau ua nres txhais los yog ua cov proteins los ntawm stringing amino acids ua ke. Muaj peb RNA nres codons : UAG, UAA, and UGA. Hauv DNA , uracil (U) yog hloov los ntawm thymine (T).

Tsis tas li ntawd, yuav ua li cas thaum tsis muaj codon nres? Nres codons yog qhov tseem ceeb rau cov kev txiav txim ntawm txoj kev txhais lus. Yog tsis muaj qhov nres codon hauv mRNA, ces nyob ntawd yog qhov muaj peev xwm hais tias Ribosome yuav synthesis mRNA kom txog rau thaum 3' kawg ntawm mRNA tsis ntsib. Thaum 3' kawg, tsis muaj codon thiab yog li, ribosome tsis tuaj yeem mus ntxiv.

Cov lus nug tseem yog, yog ATG nres codon?

Yog tias peb tsuas yog ua cov protein ntau ntxiv, peb yuav muaj qhov ntev ntev ntawm cov proteins uas tsis muaj tseeb, yog li peb xav tau qee cov cim. Thiab muaj qhov tshwj xeeb codon hu ua pib codon , uas yog ib ATG , uas pib txhua protein. Thiab tom qab ntawd thaum kawg ntawm cov proteins peb muaj qhov tshwj xeeb codon hu ua nres codons.

Puas yog ATG pib codon?

ATG lub AUG. Cov codon rau Methionine; kev txhais lus pib codon . Feem ntau, cov protein txhais tau tsuas yog pib ntawm Methionine codon (txawm tias qhov no codon tuaj yeem pom lwm qhov hauv cov protein ntau ib yam). Hauv eukaryotic DNA, qhov sib lawv liag yog ATG ; RNA is AUG.

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