2024 Tus sau: Elizabeth Oswald | [email protected]. Kawg hloov kho: 2024-01-13 00:07
Nyob rau hauv molecular biology thiab noob caj noob ces, transcriptional regulation yog cov txhais tau tias los ntawm lub cell tswj kev hloov ntawm DNA rau RNA, yog li orchestrating noob kev ua si.
Ib qho piv txwv ntawm kev tswj hwm kev hloov pauv yog dab tsi?
The m altose operon yog ib qho piv txwv ntawm kev tswj zoo ntawm kev sau ntawv. Thaum m altose tsis muaj nyob rau hauv E. coli, tsis muaj transcription ntawm m altose noob yuav tshwm sim, thiab tsis muaj m altose los khi rau m altose activator protein.
Yuav ua li cas koom nrog kev cai sau ntawv?
Ua ntej, kev hloov pauv yog tswj hwm los ntawm txwv tus nqi ntawm mRNA uas yog tsim los ntawm cov noob tshwj xeeb. Qib thib ob ntawm kev tswj hwm yog los ntawm cov xwm txheej tom qab kev hloov pauv uas tswj cov kev txhais ntawm mRNA rau hauv cov protein. Txawm tias tom qab tsim cov protein, cov kev hloov pauv tom qab tuaj yeem cuam tshuam nws txoj haujlwm.
Txoj cai tswjfwm kev hloov pauv hauv eukaryotes yog dab tsi?
Raws li cov kab mob, kev hloov pauv hauv cov hlwb eukaryotic yog tswj los ntawm proteins uas khi rau cov txheej txheem tswj hwm tshwj xeeb thiab hloov pauv cov haujlwm ntawm RNA polymerase. …
Txoj cai kev hloov pauv tau tshwm sim nyob qhov twg?
Cov txheej txheem ntawm kev sau thiab txhais lus yog lub cev sib cais los ntawm cov ntaub so ntswg nuclear; transcription tshwm sim tsuas yog nyob rau hauv lub nucleus, thiab kev txhais lus tshwm sim tsuas yog sab nraum lub nucleus nyob rau hauv lub cytoplasm. Cov kev cai ntawm cov noob qhia tuaj yeem tshwm sim txhuatheem ntawm cov txheej txheem (Daim duab 1).
Pom zoo:
Dab tsi yog qhov hloov pauv thiab hloov pauv hloov pauv?
Point mutations hloov ib leeg nucleotide. Frameshift kev hloov pauv yog ntxiv lossis tshem tawm ntawm nucleotides uas ua rau muaj kev hloov pauv hauv kev nyeem ntawv. frameshift thiab point mutation yog dab tsi? Ib qho kev hloov pauv cuam tshuam rau ib khub hauv paus.
Qhov kev hloov pauv no puas yuav ua rau muaj kev hloov pauv hloov pauv?
Yog li, yog tias muaj kev hloov pauv, piv txwv li, kev ntxig lossis tshem tawm ntawm nucleotide, tshwm sim, qhov no tuaj yeem ua rau kev hloov pauv ntawm kev nyeem ntawv. Nws hloov tag nrho cov amino acid ib ntus. Cov kev hloov pauv no yog hu ua frameshift mutation (tseem hu ua kev nyeem ntawv hloov pauv, nyeem ntawv hloov pauv, lossis framing yuam kev).
Qhov twg yog qhov kev hloov pauv hloov pauv hloov pauv?
Semiconservative replication piav qhia txog cov txheej txheem ntawm DNA replication nyob rau hauv tag nrho cov paub hlwb. DNA replication tshwm sim ntawm ntau lub hauv paus pib ntawm kev rov ua dua raws DNA qauv strand. Raws li DNA ob chav helix yog unwound by helicase, replication tshwm sim nyias ntawm txhua tus qauv strand nyob rau hauv antiparallel cov lus qhia.
Qhov kev hloov pauv twg yog xav tias yuav cuam tshuam los ntawm kev hloov pauv hloov pauv?
Dependent Variable Qhov sib txawv uas nyob ntawm lwm yam uas ntsuas. Cov kev hloov pauv no yuav tsum tau hloov pauv raws li qhov kev sim ua haujlwm ntawm tus kheej hloov pauv lossis hloov pauv. Nws yog cov nyhuv presumed. Qhov kev tshawb fawb hloov pauv twg yog qhov tshwm sim?
Los ntawm kev hloov pauv hloov pauv hloov pauv?
Kev hloov pauv hloov pauv hloov pauv (TMA) yog qhov isothermal (tsis hloov pauv nucleic acid kub), ib leeg-tube nucleic acid amplification system siv ob lub enzymes, RNA polymerase thiab thim rov qab kev sau ntawv. … Cov txheej txheem no tuaj yeem siv los tsom rau RNA thiab DNA.
