Puas yog ib qho nucleus pom hauv cov hlwb prokaryotic?
Puas yog ib qho nucleus pom hauv cov hlwb prokaryotic?

Video: Puas yog ib qho nucleus pom hauv cov hlwb prokaryotic?

Video: Puas yog ib qho nucleus pom hauv cov hlwb prokaryotic?
Video: Ua poj nrauj vim nyiam sib deev. 10/7/2017 2024, Kaum ib hlis
Anonim

Prokaryotes yog cov kab mob unicellular uas tsis muaj organelles los yog lwm yam kab mob hauv cov kab mob sib txuas. Yog li ntawd, lawv tsis muaj ib tug nucleus , tab sis, es tsis txhob, feem ntau muaj ib qho chromosome: ib daim ntawm cov voj voog, ob-stranded DNA nyob nyob rau hauv ib cheeb tsam ntawm lub cell hu ua nucleoid.

Tib neeg kuj nug, puas hlwb prokaryotic muaj nucleus?

Qhov txawv yog tias eukaryotic hlwb muaj ib "true" nucleus muaj lawv DNA, hos prokaryotic cell ua tsis yog muaj ib nucleus . Ob leeg eukaryotes thiab muaj cov prokaryotes loj RNA / protein cov qauv hu ua ribosomes, uas tsim cov protein, tab sis cov ribosomes ntawm prokaryotes yog me dua cov eukaryotes.

Tom qab ntawd, lo lus nug yog, puas hlwb eukaryotic muaj lub nucleus? Hom ntawm Cells Eukaryotic hlwb muaj organelles ntawm daim nyias nyias, thaum prokaryotic cell ua tsis yog. Eukaryotic hlwb muaj cov nucleus uas muaj cov ntaub ntawv caj ces hu ua DNA, thaum prokaryotic cell ua tsis yog. Hauv prokaryotic hlwb , DNA tsuas yog ntab ib ncig ntawm lub cell.

Kuj Paub, vim li cas ho tsis muaj cov cell prokaryotic muaj nucleus?

Prokaryotes ua muaj lawv genomic DNA concentrated thiab localized mus rau ib cheeb tsam me me nyob rau hauv lub cell (lub cheeb tsam nucleoid). Yog li nws tsis yog kiag li hais tias prokaryotes tsis txhob muaj nucleus . Txawm li cas los xij lawv tsis muaj 'qhov tseeb' nucleus uas yog membrane khi.

Lub nucleus ua dab tsi hauv lub cell prokaryotic?

Nucleoid Region Txawm tias lawv ua tsis muaj ib nucleus , prokaryotic hlwb tseem khaws lawv cov noob ntawm chromosomes thiab tseem tswj lawv cov DNA. Cov no hlwb nqa tawm ntau ntawm cov DNA no ua haujlwm hauv qhov chaw tshwj xeeb hu ua thaj av nucleoid. Lub cheeb tsam nucleoid muaj cov proteins thiab feem ntau tsuas yog ib ncig chromosome.

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