Cov txheej txheem:
- Vim li cas histone proteins tsis tuaj hauv prokaryotes?
- Puas muaj histones nyob hauv eukaryotes?
- Puas muaj histones nyob rau hauv cov kab mob?
- Puas histones tsis nyob hauv cov kab mob?
Video: Puas muaj histones nyob rau hauv prokaryotes?
2024 Tus sau: Fiona Howard | [email protected]. Kawg hloov kho: 2024-01-10 06:38
Thaum eukaryotes qhwv lawv DNA nyob ib ncig ntawm cov proteins hu ua histones los pab ntim cov DNA rau hauv qhov chaw me, feem ntau cov prokaryotes tsis muaj histones (nrog rau kev zam ntawm cov tsiaj hauv lub npe Archaea). Yog li, ib txoj hauv kev prokaryotes compress lawv DNA mus rau hauv qhov chaw me me yog los ntawm supercoiling supercoiling DNA supercoiling yog hais txog dhau- lossis qis qis ntawm DNA strand, thiab yog ib qho kev qhia ntawm cov kab mob ntawm qhov ntawd. txoj hlua. … Tsis tas li ntawd, qee cov enzymes xws li topoisomerases muaj peev xwm hloov DNA topology los pab txhawb kev ua haujlwm xws li DNA replication lossis transcription. https://en.wikipedia.org › wiki › DNA_supercoil
DNA supercoil - Wikipedia
(Daim duab 1).
Vim li cas histone proteins tsis tuaj hauv prokaryotes?
Vim tias cov proteins histone tsis nyob hauv prokaryotes, muaj qhov tsis muaj tseeb chromosomes Vim tias prokaryotes xws li cov kab mob muaj cov DNA ncig tsis yog chromosomes. Lub xub ntiag ntawm cov chromosomes tseeb tuaj yeem pom hauv cov hlwb eukaryotic xws li cov nroj tsuag thiab tsiaj hlwb.
Puas muaj histones nyob hauv eukaryotes?
Histones yog ib tsev neeg ntawm cov proteins yooj yim uas koom nrog DNA hauv lub nucleus thiab pab ua kom nws mus rau hauv chromatin, lawv yog cov alkaline (pH) cov proteins, thiab lawv cov nqi zoo tso cai rau lawv koom nrog DNA. Lawv yog pom nyob rau hauv lub nucleus ntawm eukaryotic hlwb
Puas muaj histones nyob rau hauv cov kab mob?
Histones. DNA tau qhwv ib ncig ntawm cov proteins no los tsim ib qho kev hu ua chromatin thiab tso cai rau DNA tau ntim thiab ntim rau hauv qhov chaw me me thiab me dua. Hauv yuav luag txhua eukaryotes, histone-based chromatin yog tus qauv, tseem hauv cov kab mob, tsis muaj histones.
Puas histones tsis nyob hauv cov kab mob?
Bacteria tsis muaj histone proteins thiab. Los ntawm cov ntaub ntawv saum toj no peb tau pom tias lub cev golgi thiab histone proteins tsis nyob hauv cov kab mob. Li no, lo lus teb raug yog kev xaiv (B).
Pom zoo:
Nyob rau hauv av worm copulatory papillae muaj nyob rau hauv ntu?
Genital papillae yog ob khub ntawm protuberances ntawm ntu 17 thiab 19 ntawm qhov chaw ventralTxhua papilla dais lub khob ntiav zoo li kev nyuaj siab nyob rau sab saum toj uas ua haujlwm zoo li nqus thaum lub sijhawm sib sau. Ntawm ntu 18 muaj ib khub txiv neej qhov chaw mos qhib rau ntawm sab ventral .
Nyob rau hauv lub nucleosome histones raug teeb tsa hauv cov qauv twg?
Cov nucleosome core particle sawv cev rau thawj theem ntawm chromatin lub koom haum thiab yog tsim los ntawm ob daim ntawv theej ntawm txhua tus histones H2A, H2B, H3 thiab H4, sib sau ua ke hauv cov tub ntxhais octameric nrog 146-147 bp ntawm DNA nruj nreem qhwv ib ncig ntawm nws [
Puas prokaryotes puas muaj ib lub hauv paus ntawm kev rov ua dua?
DNA replication pib ntawm lub hauv paus pib ntawm replication. Tseem tsuas yog ib qho keeb kwm hauv prokaryotes (hauv E. coli, oriC) thiab nws yog tus yam ntxwv los ntawm cov arrays ntawm rov ua ntu zus . Puas prokaryotes muaj ib qho keeb kwm ntawm kev rov ua dua?
Puas prokaryotes puas muaj splicing?
Nyob rau hauv prokaryotes, splicing yog ib yam tshwm sim tsis tshua muaj tshwm sim nyob rau hauv tsis-coding RNAs, xws li tRNAs (22). Ntawm qhov tod tes, hauv eukaryotes, splicing feem ntau hu ua trimming introns thiab ligation ntawm exons hauv protein-coding RNAs .
Puas prokaryotes puas muaj nucleolus?
Prokaryotes, uas tsis muaj nucleus, tsis muaj nucleoli thiab tsim lawv cov ribosomes hauv cytosol . YPuas yog nucleolus hauv cov hlwb prokaryotic? Nyob rau hauv prokaryotes, lub cev nuclear muaj ib ncig chromosome thiab tsis muaj nucleolus thaum nyob rau sab eukaryotic cell, ib nucleolus muaj nrog ib los yog ntau dua khub, linear chromosomes .
