Yooj yim prokaryotes thiab eukaryotes (xws li fungi thiab protozoa) tsis muaj lawv. Nyob rau hauv complex multicellular kab mob (xws li nroj tsuag thiab vertebrates), introns yog hais txog 10-fold ntev tshaj lub exons, lub active, coding qhov chaw ntawm lub genome. Qhov sib lawv liag thiab ntev ntawm introns sib txawv sai heev nyob rau lub sij hawm evolutionary.
Vim li cas thiaj tsis muaj introns hauv prokaryotes?
Kev piav qhia: Cov lus teb raug yog tias prokaryotes tsuas muaj exons, whereas eukaryotes muaj exons thiab introns. Yog li ntawd, nyob rau hauv eukaryotes, thaum mRNA yog transcribed los ntawm DNA, lub introns yuav tsum tau txiav tawm ntawm lub tshiab synthesized mRNA strand. Cov exons, los yog coding sequences, ces koom ua ke.
Puas prokaryotic chromosomes muaj introns?
Prokaryotic DNA:
Puas pom dawb hauv lub cytoplasm (nyob rau hauv ib cheeb tsam hu ua nucleoid)…
Puas introns tsawg hauv prokaryotes?
Txawm hais tias muaj ntau hauv qee cov genomes organellar, nws tus kheej-splice introns yog qhov tsis tshua muaj nyob rau lwm qhov, thiab zoo li tsis tuaj yeem los ntawm feem ntau cov genomes prokaryotic nrog rau ntau eukaryotic nuclear genomes.
Puas muaj introns nyob hauv eukaryotes?
Tag nrho cov eukaryotic genomes nqaintrons ua ib feem ntawm qee cov qauv noob thiab cov introns yuav tsum raug tshem tawm los ntawm cov tshuab molecular complex hu ua spliceosome muaj tsib snRNAs thiab ntau dua 150.proteins [1, 2].
