Lub sijhawm sau ntawv, ib feem ntawm lub cell DNA ua haujlwm ua qauv rau kev tsim ntawm RNA molecule. (RNA, lossis ribonucleic acid, yog tshuaj zoo ib yam li DNA, tshwj tsis yog peb qhov sib txawv tseem ceeb tau piav qhia tom qab hauv nplooj ntawv no.)
Yuav ua li cas thaum sau npe?
Ib strand ntawm RNA yog tsim thaum lub sij hawm tus txheej txheem ntawm transcription los ntawm ib tug strand ntawm DNA. … Cov RNA nucleotides uas yog ntxiv rau cov nucleotides ntawm DNA strand tau ntxiv rau RNA polymerase. RNA polymerase tsim RNA qab zib-phosphate qaum rau kev tsim ntawm RNA strand.
Lub npe ntawm nucleic acid tsim thaum lub sijhawm hloov pauv yog dab tsi?
Kev txhais lus yog tus txheej txheem uas cov ntaub ntawv hauv ib txoj hlua DNA tau theej rau hauv lub molecule tshiab ntawm messenger RNA (mRNA).
Nucleic acid txhais li cas?
Kev txhais lus yog catalyzed los ntawm ib tug loj enzyme hu ua ribosome, uas muaj cov proteins thiab ribosomal RNA (rRNA) Kev txhais lus kuj suav nrog qee cov RNA molecules hu ua hloov RNA (t-RNA) uas tuaj yeem khi rau peb lub basepair codons ntawm tus xa xov RNA (mRNA) thiab tseem nqa cov amino acid uas tsim nyog los ntawm codon.
4 kauj ruam ntawm kev txhais lus yog dab tsi?
plaub kauj ruam ntawm kev txhais lus yog:
- Kev ua kom lossis them nyiaj ntawm tRNA.
- Initiation - lees paub ntawm pib codon, khi ntawm ribosomal subunits rau mRNA thiab tsim kev pib ua haujlwm nrog Met-tRNA ntawm P site.
- Elongation - peptide daim ntawv cog lus tsim thiab loj hlob ntawm polypeptide saw.
