Cov txheej txheem:
Video: Dab tsi yog 4 kauj ruam nyob rau hauv tus txheej txheem ntawm transcription?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2024-01-18 08:15
Transcription muaj plaub theem:
- Kev pib . Lub DNA molecule unwinds thiab sib cais los tsim ib tug me me qhib complex.
- Elongation . RNA polymerase txav raws tus qauv strand, synthesising ib mRNA molecule.
- Kev txiav txim . Hauv prokaryotes muaj ob txoj hauv kev uas tau txiav tawm.
- Kev ua haujlwm.
Ua kom pom qhov no, dab tsi yog cov kauj ruam hauv cov txheej txheem ntawm kev sau ntawv?
Transcription yuav siv sij hawm qhov chaw nyob rau hauv peb kauj ruam: pib , elongation , thiab kev txiav txim . Cov kauj ruam tau piav qhia hauv daim duab hauv qab no. Kev pib yog qhov pib ntawm transcription. Nws tshwm sim thaum lub enzyme RNA polymerase khi rau thaj tsam ntawm cov noob hu ua tus txhawb nqa.
Tsis tas li ntawd, peb theem ntawm transcription yog dab tsi? RNA Transcription Txheej Txheem: Cov txheej txheem RNA transcription tshwm sim nyob rau hauv peb theem: pib , chain elongation, thiab termination. Thawj theem tshwm sim thaum RNA Polymerase-Promoter Complex khi rau cov noob txhawb nqa hauv DNA. Qhov no tseem tso cai rau kev tshawb nrhiav qhov pib ua ntu zus rau RNA polymerase.
Tsis tas li ntawd, cov kauj ruam hauv kev txhais lus yog dab tsi?
Kev txhais lus pib ua peb theem:
- Pib: Lub ribosome sib sau ua ke ib ncig ntawm lub hom phiaj mRNA.
- Elongation: Lub tRNA hloov cov amino acid mus rau tRNA sib raug rau cov codon tom ntej.
- Kev txiav tawm: Thaum peptidyl tRNA ntsib qhov nres codon, tom qab ntawd lub ribosome folds polypeptide rau hauv nws cov qauv kawg.
Yuav ua li cas tshwm sim nyob rau hauv tus txheej txheem ntawm transcription?
Nws siv DNA ua tus qauv los ua RNA molecule. RNA ces tawm ntawm lub nucleus thiab mus rau ib tug ribosome nyob rau hauv lub cytoplasm, qhov twg txhais tshwm sim . Nws yog kev hloov ntawm cov lus qhia caj ces hauv DNA mus rau tus tub txib RNA (mRNA). Thaum kev sau ntawv , ib strand ntawm mRNA yog tsim uas yog ntxiv rau ib tug strand ntawm DNA.
Pom zoo:
Yuav ua li cas cov txheej txheem ntawm cell faib nyob rau hauv eukaryotes feem ntau zoo ib yam li cell faib nyob rau hauv prokaryotes?
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