Thaum pib, qhov me me ribosomal subunit khi rau pib ntawm mRNAib ntus. Tom qab ntawd ib qho kev hloov pauv RNA (tRNA) molecule nqa cov amino acid methionine khi rau qhov hu ua pib codon ntawm mRNA ib ntus. … Thaum kawg, kev txiav tawm tshwm sim thaum lub ribosome mus txog qhov nres codon (UAA, UAG, thiab UGA).
Qhov kawg ntawm mRNA khi rau ribosome?
Qhov kev sib koom ua ke hauv paus no ua rau cov kab mob ribosomes pib txhais lus tsis yog ntawm 5' kawg ntawm mRNA tab sis kuj nyob rau ntawm qhov chaw pib ntawm cov lus polycistronic. Hauv qhov sib piv, ribosomes paub txog feem ntau eukaryotic mRNAs los ntawm kev khi rau 7-methylguanosine cap ntawm lawv 5' terminus (saib daim duab 6.39).
ribosomes txuas rau mRNA qhov twg?
Thaum mRNA yog tsim nyob rau hauv lub nucleus thaum transcription, nws tawm lub nucleus los ntawm lub nuclear pores mus rau hauv lub cytoplasm. Nws ces txuas mus rau lub ribosome qhov twg, cov qab zib-phosphate qaum qaum yog txuas rau chav tsev me ntawm ribosomethiab ob codons raug nthuav tawm hauv lub bigunit ntawm ribosome rau kev txhais lus.
Puas mRNA khi rau rRNA?
Lawv ua lub luag haujlwm tseem ceeb hauv kev tsim cov chaw catalytic ntawm kev txhais ntawm mRNA. Thaum lub sij hawm txhais lus ntawm mRNA, rRNA ua haujlwm los khi ob qho tib si mRNA thiab tRNA txhawm rau pab txhawb cov txheej txheem ntawm kev txhais mRNA lub codon sib lawv liag rau hauv cov amino acids.
Dab tsi yog 3 qhov chaw khi ntawm ribosome qhov twg tRNA khi rau?
Nyobribosome siv tRNAs los txuas cov ntsiab lus ntawm RNA thiab protein worlds thaum lub sij hawm protein synthesis, piv txwv li ib tug anticodon raws li ib chav tsev ntawm cov ntaub ntawv genetic ntaub ntawv nrog rau cov amino acid raws li lub tsev ntawm cov proteins. Peb qhov chaw tRNA-binding nyob rau ntawm ribosome, hu ua A, P thiab E qhov chaw.
