Yuav ua li cas thaum pib ntawm kev txhais lus?
Yuav ua li cas thaum pib ntawm kev txhais lus?

Video: Yuav ua li cas thaum pib ntawm kev txhais lus?

Video: Yuav ua li cas thaum pib ntawm kev txhais lus?
Video: Yuav tawm ntawm txoj kev txom nyem tau li cas? 2024, Kaum ib hlis
Anonim

Kev txhais lus tshwm sim nyob rau hauv ib tug qauv hu ua lub ribosome, uas yog lub Hoobkas rau synthesis ntawm cov proteins. Kev txhais lus mRNA molecule los ntawm ribosome tshwm sim nyob rau hauv peb theem: pib, elongation, thiab termination. Thaum pib, lub me me ribosomal subunit khi rau lub pib ntawm mRNA sequence.

Ntxiv mus, thawj kauj ruam ntawm kev txhais lus yog dab tsi?

Cov txheej txheem ntawm txhais lus tuaj yeem tawg ua peb theem. Cov thawj theem yog pib. Hauv no kauj ruam , tshwj xeeb "initiator" tRNA nqa cov amino acid methionine khi rau ib qho chaw tshwj xeeb ntawm lub me subunit ntawm ribosome (lub ribosome yog tsim los ntawm ob subunits, lub subunit me me thiab loj subunit).

Ib sab saum toj no, 3 kauj ruam ntawm kev txhais lus yog dab tsi? Kev txhais lus: Pib, nruab nrab, thiab xaus Kev txhais lus muaj ntau yam zoo tib yam peb ntu, tab sis lawv muaj cov npe zoo dua: pib , elongation , thiab kev txiav txim. Kev pib ("pib"): nyob rau theem no, lub ribosome tau ua ke nrog mRNA thiab thawj tRNA thiaj li pib txhais lus.

Xav txog qhov no, dab tsi tshwm sim thaum pib txhais lus?

Pib kev txhais lus tshwm sim Thaum mRNA, tRNA, thiab cov amino acid sib ntsib hauv ribosome. Thaum elongation , amino acids txuas ntxiv mus rau txoj kab, tsim cov saw ntev ua ke los ntawm peptide bonds. Thaum ib tug nres codon mus txog lub ribosome, txhais lus nres, lossis xaus.

Dab tsi tshwm sim hauv kev txhais lus ntawm 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 txav raws mRNA, sib piv 3 lub hauv paus khub ntawm ib lub sij hawm thiab ntxiv cov amino acids rau cov saw hlau polypeptide.

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