Video: Puas yog ib qho nucleus pom hauv cov hlwb prokaryotic?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
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.
Pom zoo:
Puas yog chromatin pom hauv cov hlwb prokaryotic?
Lub nucleus ntawm eukaryotic hlwb yog tsim los ntawm cov protein thiab deoxyribonucleic acid, los yog DNA. Lub DNA yog nruj nreem qhwv ib ncig ntawm cov protein tshwj xeeb hu ua histones; Qhov sib xyaw ntawm DNA thiab histone proteins yog hu ua chromatin. Txawm hais tias cov cell prokaryotic tsis muaj nucleus, lawv muaj DNA
Dab tsi yog pom hauv eukaryotic hlwb tab sis tsis yog cov hlwb prokaryotic?
Eukaryotic hlwb muaj cov kab mob sib txuas ua ke, xws li cov nucleus, thaum cov hlwb prokaryotic tsis ua. Qhov sib txawv hauv cellular qauv ntawm prokaryotes thiab eukaryotes muaj xws li muaj mitochondria thiab chloroplasts, phab ntsa cell, thiab cov qauv ntawm chromosomal DNA
Dab tsi tsuas pom muaj nyob hauv cov hlwb prokaryotic?
Ib tug raug prokaryotic cell muaj cov cell membrane, chromosomal DNA uas yog concentrated nyob rau hauv ib tug nucleoid, ribosomes, thiab ib tug cell phab ntsa. Qee cov hlwb prokaryotic kuj tseem muaj flagella, pili, fimbriae, thiab tshuaj ntsiav
Dab tsi yog qhov txawv ntawm cov hlwb prokaryotic thiab prokaryotic?
Prokaryotes yog cov kab mob uas tsim los ntawm cov hlwb uas tsis muaj cell nucleus los yog ib qho membrane-encased organelles. Eukaryotes yog cov kab mob uas tsim los ntawm cov hlwb uas muaj cov membrane-bound nucleus uas tuav cov khoom siv noob caj noob ces nrog rau cov kab mob membrane-bound organelles
Leej twg biologist tau qhia lub sij hawm prokaryote nyob rau hauv 1937 kom paub qhov txawv hlwb uas tsis muaj nucleus los ntawm nucleated hlwb ntawm cov nroj tsuag thiab tsiaj txhu?
Prokaryote / Eukaryote nomenclature tau thov los ntawm Chatton hauv 1937 los faib cov kab mob nyob rau hauv ob pawg loj: prokaryotes (cov kab mob) thiab eukaryotes (cov kab mob uas muaj cov cell nucleated). Tau txais los ntawm Stanier thiab van Neil qhov kev faib tawm no tau lees paub thoob ntiaj teb los ntawm cov kws tshawb fawb txog biologist txog tam sim no (21)