2024 Tus sau: Elizabeth Oswald | [email protected]. Kawg hloov kho: 2024-01-13 00:07
Thaum lub sijhawm DNA rov ua dua (luam tawm), feem ntau DNA polymerases tuaj yeem "kuaj lawv cov haujlwm" nrog txhua lub hauv paus uas lawv ntxiv. Cov txheej txheem no hu ua proofreading. … Polymerase ntaus tias cov hauv paus yog mispaired. Polymerase siv 3' mus rau 5' exonuclease kev ua kom tshem tawm qhov tsis raug T los ntawm 3' kawg ntawm txoj hlua tshiab.
Kev ua pov thawj ua dab tsi hauv DNA?
DNA polymerase proofreading yog ib qho kev tshuaj xyuas kev sau ntawv uas ua kom DNA polymerases tshem tawm cov kev tsim tshiab nucleotide incorporation yuam kev los ntawm primer terminus ua ntej ntxiv primer txuas ntxiv thiab tseem tiv thaiv kev hloov pauv.
DNA polymerase twg ua pov thawj hauv DNA replication?
Ib txoj haujlwm tseem ceeb ntawm kev rov ua dua DNA polymerases yog rov ua dua DNA nrog qhov raug siab heev. Kev ncaj ncees ntawm DNA replication relies on nucleotide selectivity ntawm replicative DNA polymerase, exonucleolytic proofreading, thiab postreplicative DNA mismatch kho (MMR).
Kev nyeem ntawv pov thawj ua li cas rau qhov raug ntawm DNA rov ua dua?
Kev Tshawb Fawb los ntawm DNA polymerase kho qhov yuam kev thaum rov ua dua. Qee qhov yuam kev tsis raug kho thaum rov ua dua, tab sis hloov kho tom qab rov ua tiav; Hom kev kho no yog hu ua kev kho tsis sib haum (Daim duab 2). … Hauv kev kho tsis sib haum, qhov tsis raug ntxiv hauv paus raug kuaj pom tom qab rov ua dua.
Qhov kev ua enzyme twg koom nrogproofreading thaum DNA replication?
Lwm qhov tseem ceeb ntawm lub luag haujlwm rau qhov raug ntawm DNA replication yog qhov kev ua pov thawj ntawm DNA polymerase. Raws li twb tau sau tseg lawm, E. coli polymerase kuv muaj 3′ txog 5′ as well as 5′ rau 3′ exonuclease act.
Pom zoo:
Nyob rau hauv replication okazaki fragments elongate?
Thaum lub sijhawm DNA rov ua dua, Okazaki tawg yog siv los ua kom ntev. … Lub lagging strand deb ntawm lub replication diav rawg replication diav rawg Lub replication diav rawg yog a qauv uas tsim nyob rau hauv lub ntev helical DNA thaum lub sij hawm DNA replication.
Yuav ua li cas txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau pom kev pom?
Txawm li cas los xij, corneal collagen cross-linking - cov txheej txheem qib siab tau pom zoo los ntawm US Food and Drug Administration (FDA) hauv xyoo 2016 - tuaj yeem txhim kho qhov pom kev hauv cov neeg mob txhua hnub nyoog. Corneal collagen cross-linking (CXL) tsis yog kho rau keratoconus, tab sis nws tuaj yeem pab tiv thaiv tus mob kom tsis txhob mob hnyav.
Thaum dna replication pib hlwb?
Teb: Qhov pib ntawm DNA replication tshwm sim nyob rau hauv ob kauj ruam. Ua ntej, ib lub npe hu ua pib cov protein ua kom luv luv ntawm DNA ob helix. Tom qab ntawd, cov protein hu ua helicase txuas rau thiab rhuav tshem cov hydrogen bonds ntawm lub hauv paus ntawm DNA strands, yog li rub tawm ob txoj hlua.
Puas mesosome pab hauv dna replication?
Ntawm thaj tsam ntawm plasma membrane. Cov lus qhia: Mesosome yog cov kab mob organelle uas ua raws li kev cuam tshuam ntawm cov ntshav plasma thiab ua haujlwm hauv txawm tias rov ua dua ntawm DNA thiab cell faib lossis tshem tawm ntawm exoenzymes.
Leej twg detering nyob rau hauv tag nrho cov nyob ntsiag to nyob rau sab hnub poob pem hauv ntej?
Detering yog tus neeg ua liaj ua teb los ntawm Txhua Tus Neeg Tsis Txaus Siabntawm Sab Hnub Poob los ntawm Erich Maria Remarque. Nws muaj siab mos siab muag, tshwj xeeb tshaj yog thaum nws los txog rau nees. Nws muaj kev kub ntxhov loj heev thaum nws hnov cov nees quaj thiab txawm sim tua lawv kom kawg lawv txoj kev txom nyem.
