Video: Cov poov xab puas muaj DNA?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Txawm hais tias nws yuav zoo li ntawd poov xab thiab tib neeg muaj me ntsis sib xws, poov xab yog eukaryotic kab mob. Qhov no txhais tau tias, zoo li peb cov hlwb, poov xab hlwb muaj ib tug nucleus uas muaj DNA ? ntim rau hauv chromosomes?. Poov xab cov hlwb qhia ntau yam khoom lom lom nrog peb cov hlwb.
Ua raws li qhov no hauv kev xav, dab tsi ua poov xab thiab tib neeg lub hlwb muaj sib xws?
Ib qho tseem ceeb ntawm cov no cov poov xab uas ua rau lawv muaj txiaj ntsig zoo rau kev kawm txog cov txheej txheem lom neeg hauv tib neeg , yog lawv hlwb , zoo li peb, muaj ib tug nucleus muaj DNA? ntim rau hauv chromosomes. Feem ntau metabolic thiab cellular txoj kev xav tias yuav tshwm sim hauv tib neeg , tuaj yeem kawm hauv poov xab.
DNA nyob qhov twg hauv cov poov xab? Zoo li lwm yam kab mob eukaryotic, lub cov poov xab muaj ib tug zoo-organized nucleus khi nyob rau hauv ib daim nyias nyias. Lub nucleus muaj ob-stranded chromosomes uas dhau mus DNA thaum yug me nyuam.
Kuj kom paub, cov poov xab thiab tib neeg puas koom nrog cov kab mob caj ces?
Qhov ntawd yog vim peb qhia ib tsoom yawg koob nrog poov xab , thiab ib txoj kev tshawb fawb tshiab hauv phau ntawv Journal Science qhia tias peb kuj qhia pua pua noob uas tsis tau hloov tiag tiag hauv ib txhiab xyoo. Edward Marcotte, biologist ntawm University of Texas ntawm Austin, paub qhov ntawd tib neeg thiab poov xab muaj ntau txhiab tus zoo sib xws noob.
Puas yog cov poov xab DNA ncig lossis linear?
Poov xab yog ib qhov chaw tshwj xeeb ntawm cytoplasmically replicating kab tawm plasmids. Cov no linear DNA molecules yuav txawv nyob rau hauv ntau txoj kev los ntawm cov ncig plasmids uas replicate nyob rau hauv lub nucleus. Ib qho kev ntsuas yooj yim yog qhov sib txawv loj hauv kev nkag siab rau lub teeb ultraviolet (UV) hauv vivo.
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