Video: Dab tsi tshwm sim hauv kev txhais lus ntawm DNA?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
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.
Tsis tas li ntawd, dab tsi yog cov kauj ruam ntawm DNA txhais lus?
Kev txhais lus yog ib txoj hauv kev los ntawm cov noob caj noob ces muaj nyob rau hauv ib qho mRNA molecule yog txiav txim siab los tsim cov kab ke tshwj xeeb ntawm cov amino acids hauv cov saw hlau polypeptide. Nws tshwm sim nyob rau hauv cytoplasm tom qab transcription thiab, zoo li transcription, muaj peb theem : pib, elongation thiab termination.
Yuav ua li cas thaum qhib kev txhais lus? Kev txhais lus tshwm sim nyob rau hauv plaub theem: ua kom (ua kom npaj), pib (pib), elongation (ua kom ntev) thiab txiav (stop). Cov ntsiab lus no piav qhia txog kev loj hlob ntawm cov amino acid saw (polypeptide). Hauv ua kom theem, qhov tseeb amino acid yog covalently bonded mus rau qhov tseeb hloov RNA (tRNA).
Ib yam li ntawd, tib neeg nug, 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.
DNA txhais li cas rau mRNA?
Kev sau ntawv. Transcription yog tus txheej txheem uas DNA yog theej (transcribed) rau mRNA , uas nqa cov ntaub ntawv xav tau rau kev tsim cov protein. Tus tub txib ua ntej RNA yog tom qab ntawd "kho" los tsim qhov xav tau mRNA molecule hauv cov txheej txheem hu ua RNA splicing.
Pom zoo:
Dab tsi tshwm sim ntawm Theodor Engelmann qhov kev sim nto moo qhia rau nws uas wavelength S yog tus tsav tsheb zoo tshaj plaws ntawm photosynthesis?
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