Video: Yuav ua li cas thaum DNA transcription?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Kev sau ntawv yog tus txheej txheem uas ib tug gene DNA kab lus yog theej ( luam tawm ) los ua ib qho RNA molecule. RNA polymerase siv ib qho ntawm cov DNA strands (cov qauv strand) raws li ib tug qauv los ua ib tug tshiab, complementary RNA molecule. Kev sau ntawv xaus rau hauv tus txheej txheem hu ua termination.
Ib yam li ntawd, tib neeg nug, dab tsi yog txheej txheem ntawm DNA transcription?
kev sau ntawv / DNA transcription . Kev sau ntawv yog cov txheej txheem los ntawm uas cov ntaub ntawv nyob rau hauv ib tug strand ntawm DNA yog theej rau hauv ib lub molecule tshiab ntawm tus tub txib RNA (mRNA). Kev sau ntawv yog ua los ntawm ib tug enzyme hu ua RNA polymerase thiab ib tug xov tooj ntawm accessory proteins hu ua kev sau ntawv yam.
Tsis tas li ntawd, yuav ua li cas thaum DNA txhais lus? 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. Nws yog qhov tseem ceeb a txhais lus los ntawm ib tug code (nucleotide sequence) mus rau lwm code (amino acid sequence).
Hais txog qhov no, ua li cas thaum txhua theem ntawm kev sau ntawv?
Transcription tshwm sim hauv peb kauj ruam-pib, elongation, thiab termination- tag nrho qhia ntawm no. Transcription yuav siv qhov chaw nyob rau hauv peb kauj ruam: pib, elongation, thiab termination. Initiation yog qhov pib ntawm kev sau ntawv . Nws tshwm sim Thaum cov enzyme RNA polymerase khi rau thaj tsam ntawm ib lub noob hu ua tus txhawb nqa.
Puas yog DNA ncaj qha koom nrog hauv kev sau ntawv?
Kev sau ntawv yog tus txheej txheem uas DNA yog theej ( luam tawm ) mus rau mRNA, uas nqa cov ntaub ntawv xav tau rau kev tsim cov protein. Kev sau ntawv yuav tshwm sim nyob rau hauv ob kauj ruam dav. Ua ntej, ua ntej tus tub txib RNA yog tsim, nrog rau kev koom tes ntawm RNA polymerase enzymes.
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