Video: TRNA tsim li cas?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Synthesis ntawm tRNA
Hauv eukaryotic hlwb, tRNA yog tsim los ntawm cov protein tshwj xeeb uas nyeem DNA code thiab ua RNA luam, lossis ua ntej. tRNA . Cov txheej txheem no hu ua transcription thiab ua tRNA Nws yog ua los ntawm RNA polymerase III. Ua ntej- tRNA raug ua tiav thaum lawv tawm hauv lub nucleus.
Ib yam li ntawd, tib neeg nug, qhov twg yog tRNA tsim?
Hauv eukaryotes, tRNA yog tsim nyob rau hauv lub nucleus los ntawm DNA qauv los ntawm RNA Polymerase III, hloov muaj (nrog rau cov excision ntawm introns thiab txuas ntawm nws coj amino acid), ces exported los ntawm lub nucleus mus rau lub cytoplasm rau siv nyob rau hauv ua cov proteins tshiab.
Qhov thib ob, tRNA txhais li cas? Thaum kev sau ntawv , tus xa xov ribonucleic acid, lossis mRNA, yog tsim los ntawm DNA qauv. Qhov mRNA no ua ke nrog ribosomal RNA, hu ua rRNA, thiab hloov RNA, lossis tRNA , complex los txhais cov mRNA code rau hauv cov amino acid sequence, protein. Txhua lub hauv paus hauv DNA phim lwm lub hauv paus.
Hauv qhov no, rRNA thiab tRNA tsim li cas?
Hauv eukaryotes, pre- rRNAs yog transcribed, tiav, thiab sib sau ua ke rau hauv ribosomes nyob rau hauv lub nucleolus, thaum pre- tRNAs yog transcribed thiab ua tiav nyob rau hauv lub nucleus thiab ces tso rau hauv lub cytoplasm qhov twg lawv txuas mus rau dawb amino acids rau protein synthesis.
Puas yog tRNA tsim los ntawm DNA?
Hloov RNA, lossis tRNA , yog ib tug tswv cuab ntawm tsev neeg nucleic acid hu ua ribonucleic acids. RNA molecules muaj nucleotides, uas yog cov tsev me me rau RNA thiab DNA . tRNA muaj lub hom phiaj tshwj xeeb: coj cov protein subunits, hu ua amino acids, mus rau ribosome qhov twg cov proteins tsim.
Pom zoo:
Dab tsi yog qhov cuab yeej tsim nyog ua ntej kev tshawb xav ntawm tes yuav tsim tau?
Lub microscope yog tsim nyog ua ntej qhov kev xav ntawm tes yuav tsim. Peb tus kws tshawb fawb twg tau txais qhab nia rau cov pov thawj ncaj qha ua rau txoj kev xav ntawm tes? Matthias Schleiden, Theodor Schwann, thiab Rudolph Virchow peb yog txhua tus kws tshawb fawb uas tau pab txhawb txoj kev xav ntawm tes
Dab tsi yog txoj haujlwm ntawm tRNA hauv kev tsim cov protein?
Lub luag haujlwm tag nrho ntawm tRNA hauv kev tsim cov protein yog txiav txim siab ib qho tshwj xeeb codon ntawm mRNA, siv nws cov anticodon, txhawm rau hloov cov amino acid tshwj xeeb mus rau qhov kawg ntawm cov saw hauv ribosome. Ntau tRNAs ua ke tsim los ntawm cov amino acid saw, nws thiaj li tsim cov protein rau thawj mRNA strand
Lub chaw tsim hluav taws xob nuclear tsim tau li cas?
Nuclear fission tsim cua sov Reactors siv uranium rau nuclear roj. Cov uranium tau ua tiav rau hauv cov me me ceramic pellets thiab muab tso ua ke rau hauv cov raj hlau kaw hu ua roj rods. Lub tshav kub tsim los ntawm fission hloov cov dej mus rau hauv chav, uas tig lub turbine los tsim hluav taws xob tsis muaj carbon
Vim li cas thiaj nres thiab pib codons tsim nyog rau kev tsim cov protein?
Pib thiab nres codons yog ib qho tseem ceeb vim hais tias lawv qhia lub xov tooj ntawm tes machinery qhov twg yuav pib thiab xaus kev txhais lus, txheej txheem ntawm kev ua cov protein. Qhov pib codon cim qhov chaw ntawm qhov kev txhais lus rau hauv protein ntau pib. Qhov nres codon (los yog termination codon) cim lub vev xaib uas txhais lus xaus
Yuav ua li cas aminoacyl tRNA tsim?
Ib qho aminoacyl-tRNA synthetase (aaRS lossis ARS), tseem hu ua tRNA-ligase, yog ib qho enzyme uas txuas cov amino acid tsim nyog rau nws tRNA. Nws ua li ntawd los ntawm catalyzing lub esterification ntawm ib tug tshwj xeeb cognate amino acid los yog nws precursor rau ib tug ntawm tag nrho cov nws tau tshaj cognate tRNAs los tsim ib tug aminoacyl-tRNA