2024 Tus sau: Elizabeth Oswald | [email protected]. Kawg hloov kho: 2024-01-13 00:07
DNA polymerase muaj nuj nqi proofreading.
Yuav ua li cas cov enzymes ua pov thawj DNA?
DNA polymerases yog cov enzymes tsim DNA hauv hlwb. Thaum lub sij hawm DNA replication (copying), feem ntau DNA polymerases tuaj yeem "kuaj lawv cov haujlwm" nrog rau txhua lub hauv paus uas lawv ntxiv. Cov txheej txheem no hu ua proofreading. … Polymerase kuaj pom tias cov hauv paus yog mispaired.
Tus enzyme twg ua cov ntawv pov thawj thaum DNA rov ua dua?
Exonucleases tuaj yeem ua cov ntawv pov thawj thaum DNA polymerisation hauv DNA replication, tshem tawm cov qauv DNA txawv txawv uas tshwm sim los ntawm teeb meem nrog DNA replication diav rawg, thiab lawv tuaj yeem koom ncaj qha rau kev kho. DNA puas.
Yuav ua li cas hom enzyme yuav tsum tau rau DNA polymerase proofreading?
Replicative DNA polymerases muaj 3′ → 5′ exonuclease kev ua haujlwmtxhawm rau txo qis kev koom ua ke ntawm cov nucleotides tsis raug los ntawm kev ua pov thawj thaum rov ua dua.
Puas muaj pov thawj hauv PCR?
Proofreading PCR (PR-PCR) tau tsim los rau kev tshawb nrhiav kev hloov pauv hauv xyoo 1998 tab sis tsis tshua sivvim nws qhov ua tau zoo hauv kev ntxub ntxaug allele. Ntawm no peb tau tsim kho PR-PCR txoj kev siv ddNTP-thaiv primer thiab sib tov ntawm DNA polymerases nrog thiab tsis muaj 3'-5' proofreading muaj nuj nqi.
Pom zoo:
Yuav ua li cas ua pov thawj ua ntej ntawm cov pov thawj?
Kev xav ntawm cov pov thawj yog ib hom pov thawj cov qauv siv hauv lub nra ntawm kev tshuaj xyuas pov thawj. Raws li tus txheej txheem preponderance, lub nra ntawm cov pov thawj yog ntsib thaum tog nrog lub nra qhia tus neeg nrhiav qhov tseeb tias muaj ntau dua 50% qhov kev thov yog qhov tseeb.
Thaum lub sijhawm ua pa ntawm tes uas ntawm cov hauv qab no tso tawm los ntawm cov khoom lag luam?
Thaum lub sijhawm ua pa aerobic cellular, qabzib reacts nrog oxygen, tsim ATP uas tuaj yeem siv los ntawm tes. carbon dioxide thiab dej yog tsim los ntawm cov khoom lag luam. Hauv kev ua pa ntawm tes, qabzib thiab oxygen hnov qab tsim ATP.
Vim li cas cov pov thawj yuav tsum ua pov thawj?
Zaj qhov tseeb tsim muaj qhov tseeb ntawm lwm qhov tseeb. Lawv yog cov teeb meem ntawm cov pov thawj uas ua rau muaj ib yam dab tsi tshwm sim ntau dua los yog tsawg dua qhov nws yuav yog yam tsis muaj lawv. Lawv raug lees paub los ua pov thawj thiab pab lub tsev hais plaub hauv kev daws teeb meem zaum kawg ntawm qhov teeb meem tsis sib haum xeeb.
Lub sijhawm kuv lub sijhawm dawb lossis thaum kuv lub sijhawm dawb?
yog li, qhov no txhais tau tias "thaum kuv lub sijhawm dawb" tsis siv ntauthiab koj muab "hauv kuv lub sijhawm dawb" ntau dua nyob rau qhov kawg ntawm kab lus. Piv txwv li: Kuv tau taug kev tus dev thaum kuv lub sijhawm dawb.
Tus pov thawj tawm hauv lub pov thawj hwj li cas?
Ib tug pov thawj lub sab hauv "kev pov thawj" yeej hloov tsis tau, tiam sis nws tuaj yeem tawm ntawm txoj haujlwm ntawm kev ua pov thawj thiab raug tso tawm ntawm nws txoj haujlwm. Qhov no tuaj yeem ua tiav ntawm ntau txoj hauv kev, ib qho yog taug kev yooj yim.
