Video: Cov pov thawj dab tsi txhawb nqa endosymbiosis?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Thawj daim ntawm pov thawj uas yuav tsum tau nrhiav kev txhawb nqa tus endosymbiotic Qhov kev xav yog seb puas los yog tsis yog mitochondria thiab chloroplasts muaj lawv tus kheej DNA thiab yog tias cov DNA no zoo ib yam li cov kab mob DNA. Qhov no tom qab tau ua pov thawj tias muaj tseeb rau DNA, RNA, ribosomes, chlorophyll (rau chloroplasts), thiab protein synthesis.
Ntawm no, cov pov thawj dab tsi txhawb lub tswv yim tias cov organelles loj ntawm eukaryotes yog ib zaug cov kab mob?
Cov pov thawj qhia tias cov chloroplast no organelles ua kuj ib zaug nyob dawb kab mob . Qhov kev tshwm sim endosymbiotic uas tsim mitochondria yuav tsum tau tshwm sim ntxov hauv keeb kwm ntawm eukaryotes , vim cwb eukaryotes muaj lawv.
Kuj Paub, cov pov thawj dab tsi txhawb cov keeb kwm endosymbiotic ntawm mitochondria thiab plastids? Muaj dav pov thawj los qhia tias mitochondria thiab plastids sawv los ntawm cov kab mob thiab ib qho kev sib cav muaj zog tshaj plaws rau txhawb cov endosymbiotic txoj kev xav yog ob qho tib si mitochondria thiab plastids muaj DNA uas txawv ntawm cov cell nucleus thiab lawv muaj lawv tus kheej protein biosynthesis machinery.
Ntawm no, cov pov thawj dab tsi txhawb txoj kev xav uas eukaryotes hloov zuj zus los ntawm cov hlwb prokaryotic?
Lub hypothesis uas eukaryotic hlwb hloov zuj zus los ntawm lub koom haum symbiotic ntawm prokaryotes -endosymbiosis - tshwj xeeb tshaj yog zoo txhawb nqa los ntawm kev tshawb fawb ntawm mitochondria thiab chloroplasts, uas xav tias muaj hloov zuj zus los ntawm cov kab mob nyob hauv loj hlwb.
Puas muaj pov thawj tias mitochondria hloov zuj zus los ntawm cov hlwb prokaryotic?
Mitochondria thiab chloroplasts ntseeg tau tias muaj tsim tawm los ntawm cov kab mob symbiotic, tshwj xeeb tshaj yog alpha-proteobacteria thiab cyanobacteria, feem. Cov txoj kev xav hais tias prokaryotic cell tau noj los yog engulfed los ntawm ib loj dua cell . Los ntawm qee qhov laj thawj tsis paub, cov prokaryotic organelle tsis tau noj.
Pom zoo:
Dab tsi yog cov pov thawj hauv kev txhawb nqa ntawm continental drift txoj kev xav?
Cov ntaub ntawv pov thawj rau thaj av drift Wegener paub tias cov nroj tsuag fossil thiab tsiaj xws li mesosaurs, cov tsiaj reptiles dej tshiab pom tsuas yog South America thiab Africa thaum lub sijhawm Permian, tuaj yeem pom nyob rau ntau lub tebchaws. Nws kuj tau sib tw pob zeb ntawm ob sab ntawm Dej Hiav Txwv Atlantic zoo li cov duab dhos ua si
Dab tsi yog cov pov thawj rau txoj kev xav ntawm endosymbiosis?
Cov pov thawj qhia tias cov chloroplast organelles kuj yog ib zaug cov kab mob dawb nyob. Qhov kev tshwm sim endosymbiotic uas tsim mitochondria yuav tsum tau tshwm sim thaum ntxov hauv keeb kwm ntawm eukaryotes, vim tias txhua tus eukaryotes muaj lawv
Koj ua pov thawj li cas cov kab yog sib npaug hauv cov ntawv pov thawj?
Thawj yog yog tias cov ces kaum sib thooj, cov ces kaum uas nyob rau tib lub ces kaum ntawm txhua qhov kev sib tshuam, sib npaug, ces cov kab sib npaug. Qhov thib ob yog yog tias qhov sib txawv sab hauv lub kaum sab xis, cov ces kaum uas nyob rau sab nraud ntawm lub transversal thiab sab hauv cov kab sib npaug, sib npaug, ces cov kab sib npaug
Dab tsi pov thawj siv cov duab ntawm lub dav hlau sib koom ua pov thawj cov khoom geometric?
Cov ntaub ntawv pov thawj uas siv cov duab ntawm lub dav hlau sib koom ua pov thawj geometric zog yog hu ua trigonometric
Cov pov thawj fossil twg txhawb nqa lub tswv yim ntawm kev sib tw sab av loj?
Daim duab 6.6: Wegener siv cov pov thawj fossil los txhawb nws qhov kev xav ntawm sab av loj. Cov pob txha ntawm cov kab mob no muaj nyob hauv thaj av uas tam sim no nyob deb. Wegener tau hais tias thaum cov kab mob tseem muaj sia nyob, cov av tau koom nrog thiab cov kab mob tau nyob ib sab