Chiphunzitso cha Prokaryotic kupita ku Eukaryotic: Kusintha kwa Kuvuta kwa Ma Cellular
Pendauluan
Kusintha kwa moyo padziko lapansi ndi chimodzi mwa zinsinsi zodabwitsa kwambiri zomwe zakopa asayansi kwa zaka mazana ambiri. Magulu awiri akuluakulu a zamoyo, ma prokaryotes ndi ma eukaryotes, akuyimira chimodzi mwa zinthu zofunika kwambiri pakusintha kwa zinthu. Ma prokaryotes, omwe akuphatikizapo mabakiteriya ndi ma archaea, ndi zamoyo zosavuta, zokhala ndi selo limodzi zomwe zakhalapo kwa zaka mabiliyoni ambiri. Mosiyana ndi zimenezi, ma eukaryotes—omwe akuphatikizapo ma protists, bowa, zomera, ndi nyama—ali ndi maselo ovuta kwambiri. Komabe, momwe kusintha kuchokera ku maselo osavuta a prokaryotic kupita ku maselo ovuta a eukaryotic kunachitikirabe ndi nkhani yofufuza kwambiri komanso yokambirana. Nkhaniyi ifufuza mfundo zazikulu zomwe zikufotokoza kusintha kuchokera ku ma prokaryotes kupita ku ma eukaryotes.
Chiyambi cha Moyo wa Ma Cellular
Zaka mabiliyoni ambiri zapitazo, Dziko Lapansi linali malo osiyana kwambiri ndi masiku ano. Mlengalenga mwake munalibe mpweya, ndipo moyo wa maselo sunalipo. Moyo woyamba mwina unayamba kukhala ngati maselo a prokaryotic pafupifupi zaka 3,5 mpaka 4 biliyoni zapitazo. Ma prokaryotes awa ndi makolo a zamoyo zonse zomwe zimadziwika masiku ano. Anakula bwino m'malo ovuta kwambiri, zomwe zimasonyeza kusinthasintha kodabwitsa. Komabe, kusintha kuchoka ku zamoyo zosavuta za prokaryotic zokhala ndi selo imodzi kupita ku zamoyo zovuta kwambiri za eukaryotic kunafuna kusintha kwakukulu mu kapangidwe ka maselo ndi ntchito yawo.
Kuganiza kwa Endosymbiosis
Limodzi mwa malingaliro odziwika bwino okhudza kusintha kwa maselo a eukaryotic ndi lingaliro la endosymbiotic, lomwe linaperekedwa koyamba ndi wasayansi waku America Lynn Margulis mu 1967. Malinga ndi chiphunzitsochi, ma organelle ofunikira m'maselo a eukaryotic, monga mitochondria ndi ma chloroplast, adayambira ngati mabakiteriya a prokaryotic omwe amapanga ubale wogwirizana ndi selo lalikulu, loyambirira la wolandirayo.
1. Mitochondria: Amakhulupirira kuti makolo akale a maselo a eukaryotic anali ndi mabakiteriya a aerobic, omwe ankatha kugwiritsa ntchito mpweya kuti apange mphamvu bwino kudzera mu kupuma. M'malo mogaya mabakiteriyawa, selo lolandira alendo linakhazikitsa ubale wopindulitsana. Mabakiteriya a aerobic adapereka mphamvu yothandiza kwambiri, pomwe selo lolandira alendo limapereka chitetezo ndi zakudya. Pakapita nthawi, mabakiteriya ophatikizidwawa adasanduka mitochondria yamakono.
2. Ma chloroplast: Njira yofananayi imachitika mu ma chloroplast, omwe amapezeka m'maselo a zomera ndi algae. Amakhulupirira kuti maselo akale a eukaryotic anali ndi mabakiteriya a photosynthetic monga cyanobacteria. Izi zinapatsa eukaryotic host mwayi wopangira photosynthesis, zomwe zimawalola kupanga chakudya kuchokera ku dzuwa, kenako n’kusanduka ma chloroplast.
Umboni wa lingaliro ili umaphatikizapo kufanana pakati pa mitochondria ndi ma chloroplast ndi mabakiteriya, monga kukhalapo kwa DNA yozungulira, ma ribosome omwe amafanana ndi ma ribosome a bakiteriya, ndi kuthekera kodzigawa paokha mkati mwa selo.
Kusintha kwa Kapangidwe ndi Ntchito
Kusintha kuchoka pa ma prokaryotes kupita ku ma eukaryotes sikunali kokha chifukwa cha kupeza ma mitochondria ndi ma chloroplasts. Kunaphatikizaponso kusintha kwina kwa kapangidwe kake ndi kagwiridwe ka ntchito, kuphatikizapo:
– Kupanga kwa Nuclear Membrane: Chimodzi mwa zizindikiro za maselo a eukaryotic ndi kukhalapo kwa nucleus yomwe imaphimba DNA yawo mkati mwa nucleus nembanemba. Lingaliro lofala kwambiri limasonyeza kuti nucleus nembanemba idasinthika kudzera mu kulowa kwa membrane ya selo mu ma prokaryotes oyambirira, kuteteza zinthu za majini ndikuwongolera momwe majini amagwirira ntchito.
– Zipangizo Zovuta Kwambiri za Majini: Ma Eukaryote amakhala ndi DNA yayitali komanso yovuta kwambiri kuposa ma prokaryote, omwe amakonzedwa m'ma chromosome olunjika. Zinthu zolembera ndi RNA yovuta kwambiri yowongolera majini zinapangidwanso.
– Dongosolo la Chigoba: Ma Eukaryote amapanga mapangidwe ovuta a chigoba, zomwe zimathandiza maselo kusunga mawonekedwe awo, kusuntha zinthu mkati mwa selo, komanso kugwiritsa ntchito flagella ndi cilia poyenda.
– Kuwonjezera Ma Organelle Ena: Ma organelle ena osiyanasiyana, monga endoplasmic reticulum, Golgi apparatus, ndi lysosomes, adapangidwa kuti azisamalira kukonza mapuloteni ndi kunyamula komanso kagayidwe kake ka maselo kapamwamba kwambiri.
Udindo wa Symbiosis mu Chisinthiko
Symbiosis, ubale wachilengedwe pakati pa mitundu iwiri ya zamoyo zomwe zimakhala pafupi, unachita gawo lofunika kwambiri pakusintha kwa zovuta za maselo. Mkati mwa kusintha kuchokera ku prokaryotes kupita ku eukaryotes, symbiosis sinangopereka ubwino wosinthika komanso inatsegula njira yopititsira patsogolo zatsopano za kagayidwe kachakudya komanso kusiyanasiyana kwakukulu kwa kusintha. Mgwirizano wa symbiotic suima pamlingo wa organelle; ukhoza kuthandizira kusintha kwa madera akuluakulu, kutsogolera kusiyanasiyana kwa zamoyo zomwe zimawoneka m'malo achilengedwe amakono.
Mavuto ndi Mafunso Otseguka
Ngakhale kuti lingaliro la endosymbiosis likuvomerezedwa kwambiri, pali mavuto ambiri komanso mafunso osayankhidwa, monga:
– Njira Zapadera: Momwe njira yopezera madzi okwanira komanso kukhazikika kwa mgwirizano wa nthawi yayitali sizikumveka bwino.
– Chiyambi cha Ma Organelle Ena: Ngakhale kuti mitochondria ndi ma chloroplast akunenedwa kuti amachokera ku mabakiteriya akale, chiyambi cha ma organelle ena m'maselo a eukaryotic sichinadziwike bwino.
– Umboni wa Zakale: Zakale sizisonyeza tsatanetsatane wa kusintha pang'onopang'ono kuchokera ku maselo a prokaryotic kupita ku maselo a eukaryotic, kotero kusanthula majini ndi zamoyo kumakhalabe umboni waukulu.
Kutseka
Kusintha kuchoka pa maselo a prokaryotic kupita ku maselo a eukaryotic kunali chimodzi mwa zinthu zofunika kwambiri m'mbiri ya moyo padziko lapansi. Ngakhale kuti zovuta za kusintha kwa maselo zimafunabe kafukufuku wambiri, malingaliro monga endosymbiosis amapereka chidziwitso chofunikira pa kayendetsedwe ka maselo komwe kunathandiza kuti moyo upitirire. Ndi kupita patsogolo kwa sayansi ya zamoyo ndi majini, tsiku lililonse timayandikira kumvetsetsa mozama momwe zamoyo zovutazi zinasinthira. Kufufuza kusinthaku sikuti kumangowonjezera kumvetsetsa kwathu za sayansi yoyambira komanso momwe moyo umasinthira ndikukula bwino poyang'anizana ndi zovuta zachilengedwe zomwe zimasintha nthawi zonse.
