Video: Cov txheej txheem twg tsim mRNA?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Transcription yog txheej txheem uas DNA tau theej (transcribed) rau mRNA , uas nqa cov ntaub ntawv xav tau rau kev tsim cov protein. Kev hloov pauv yuav tshwm sim hauv ob kauj ruam dav. Tus tub txib ua ntej RNA yog ces "edited" rau tsim tawm qhov xav tau mRNA molecule ib txheej txheem hu ua RNA splicing.
Tib neeg kuj nug, mRNA ua li cas?
mRNA yog synthesized nyob rau hauv lub nucleus siv cov nucleotide ib theem zuj zus ntawm DNA ua ib tug template. Cov txheej txheem no yuav tsum muaj nucleotide triphosphates ua substrates thiab yog catalyzed los ntawm enzyme RNA polymerase II. Cov txheej txheem ntawm kev ua mRNA los ntawm DNA yog hu ua transcription, thiab nws tshwm sim nyob rau hauv lub nucleus.
Tsis tas li ntawd, yuav ua li cas tom qab mRNA tsim? Nws tau pib thiab nres cov cim ntawm qhov chaw tshwj xeeb ntawm DNA strand. Qhov twg mRNA mus tom qab sau ntawv? tawm hauv lub nucleus, mus rau cytoplasm, khi rau ribosome nyeem.
Ib tug kuj yuav nug, dab tsi yog mRNA ua?
Eukaryotic mRNA precursors yog ua tiav los ntawm 5 'capping, 3' cleavage thiab polyadenylation, thiab RNA splicing kom tshem tawm introns ua ntej raug thauj mus rau cytoplasm qhov twg lawv tau txhais los ntawm ribosomes. Nascent ua ntej mRNA Cov ntawv sau tseg yog txuam nrog cov chav kawm ntawm ntau RNA-binding proteins hu ua hnRNP proteins.
Qhov twg zoo tshaj piav qhia yuav ua li cas mRNA raug tsim?
mRNA yog tsim los ntawm RNA polymerase, siv DNA ua tus qauv. mRNA yog tsim los ntawm DNA, siv RNA polymerase ua tus qauv. C. mRNA yog tsim los ntawm duplicating RNA pom nyob rau hauv lub nucleus.
Pom zoo:
Koj tuaj yeem ua li cas yog tias koj tsis paub tias txheej twg yog nyob rau hauv cov txheej txheem rho tawm?
Koj tuaj yeem ua li cas yog tias koj tsis paub tias txheej twg yog nyob rau hauv cov txheej txheem rho tawm? Tso dej me me rau hauv lub caj dab ntawm qhov sib cais funnel. Ua tib zoo saib nws: yog tias nws tseem nyob hauv txheej txheej sab saud, txheej txheej ntawd yog txheej dej
Dab tsi yog cov txheej txheem uas tsim cov ntawv luam tshiab ntawm cov kab mob caj ces?
Cov txheej txheem ntawm DNA replication tsim ib daim qauv tshiab ntawm cov kab mob cov ntaub ntawv caj ces kom dhau mus rau lub cell tshiab. Dawb ntab nucleotides yog txuam nrog lawv cov lus qhuas los ntawm ib qho enzyme hu ua polymerase. Cov no yog 'lub tsev.' Lawv sib sau ua ke DNA tshiab strand nrog txhua tus qub strands
Dab tsi yog txheej txheem spontaneous thiab non-spontaneous txheej txheem?
Cov txheej txheem spontaneous yog ib qho uas tshwm sim yam tsis muaj kev cuam tshuam ntawm sab nraud. Ib txoj kev uas tsis yog tshwm sim yuav tsis tshwm sim yog tias tsis muaj kev cuam tshuam ntawm sab nraud
Thaum twg cov txheej txheem twg cov hlwb siv oxygen los tso lub zog khaws cia?
Hauv cov hlwb siv oxygen los tso tawm lub zog khaws cia hauv cov suab thaj xws li qabzib. Qhov tseeb, feem ntau ntawm lub zog siv los ntawm cov hlwb hauv koj lub cev yog muab los ntawm kev ua pa ntawm tes. Ib yam li photosynthesis tshwm sim hauv organelles hu ua chloroplasts, cellular respiration tshwm sim nyob rau hauv organelles hu ua mitochondria
Cov txheej txheem twg yog txheej txheem endothermic?
Cov txheej txheem endothermic yog ib qho txheej txheem uas xav tau lossis nqus lub zog los ntawm nws qhov chaw nyob ib puag ncig, feem ntau yog ua kom sov. Nws yuav yog cov txheej txheem tshuaj, xws li dissolving ammonium nitrate hauv dej, lossis cov txheej txheem ntawm lub cev, xws li melting ntawm cov dej khov nab kuab