2024 Tus sau: Elizabeth Oswald | [email protected]. Kawg hloov kho: 2024-01-13 00:07
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.
Pom zoo:
Dab tsi yog qhov taw qhia ntawm cov hlua khi ntawm cov hlua khi?
Zuag qhia tag nrho, interarch rubber bands yog ib feem tseem ceeb ntawm kev kho hniav nrog hlau braces. Lawv tso cai rau koj tus kws kho hniav maj mam kho koj qhov tom thiab tuaj yeem txo lossis tshem tawm cov teeb meem xws li overbite, underbite underbite Mandibular prognathism yog protrusion ntawm mandible, cuam tshuam rau sab thib peb ntawm lub ntsej muag.
Lub sijhawm txhais lus n-formyl-methionine-trna khi rau mrna nrog kev pab ntawm?
Thaum N-formylmethionine (fMet)-tRNA khi nrog P site, tRNA molecule nrog an anticodon uas koom nrog codon ntawm cov neeg nyob sib ze pib codon tuaj yeem ua ke nrog cov Ib qhov chaw ntawm 70S pib ua haujlwm. TRNA khi rau mRNA li cas? TRNA khi rau codons hauv mRNA li cas?
Lub sijhawm txhais lus lub codon ntawm mrna yog 'nyeem' los ntawm?
Hauv kev txhais lus, cov codons ntawm mRNA tau nyeem nyob rau hauv kev txiav txim (los ntawm 5' kawg mus rau 3' kawg) los ntawm molecules hu ua hloov RNAs, lossis tRNAs. Txhua tRNA muaj cov tshuaj tiv thaiv kab mob, ib txheej ntawm peb nucleotides uas khi rau qhov sib txuam mRNA codon los ntawm kev sib koom ua ke.
Thaum twg hloov pauv ntawm ribosome tshwm sim?
Protein synthesis ntawm ribosomes, uas yog, kev txhais lus ntawm nucleotide sib lawv liag ntawm mRNA rau hauv cov amino acid ib ntus ntawm cov protein, yog cov txheej txheem cyclic. Nyob rau hauv txhua puag ncig ntawm elongation, ob tRNA molecules ua ke nrog cov mRNA txav los ntawm ribosome nyob rau hauv ib tug multistep txheej txheem hu ua translocation.
Lub hom phiaj ntawm cov cheeb tsam uas tsis tau txhais utrs tam sim no ntawm mrna yog dab tsi?
Cov cheeb tsam uas tsis tau txhais lus (UTRs) hauv mRNA ua si lub luag haujlwm tseem ceeb ntawm kev tswj hwm kev ruaj ntseg, kev ua haujlwm, thiab thaj chaw ntawm mRNA. 3'-UTRs ntawm mRNA kuj tseem ua cov qauv rau miRNA khi uas tswj kev hloov pauv thiab / lossis kev ua haujlwm ntawm mRNA.
