Mutu: Kumvetsetsa Ubale Pakati pa Kapangidwe ka Selo ndi Ntchito Yake: Zitsanzo ndi Kukambirana Mafunso
Pendauluan
Maselo ndi mayunitsi ang'onoang'ono kwambiri a moyo ndipo amachita gawo lofunika kwambiri pakuchita ntchito zosiyanasiyana zamoyo. Mu biology, kumvetsetsa kapangidwe ka maselo ndi ntchito yake n'kofunika kwambiri chifukwa kapangidwe ka maselo kamatsimikizira ntchito zomwe selo lingachite. Nthawi zambiri, kumvetsetsa mozama ubale pakati pa kapangidwe ka maselo ndi ntchito yake ndikofunikira kuti timvetse momwe chamoyo chimagwirira ntchito yonse. Munkhaniyi, tikambirana mafunso angapo okhudza ubale pakati pa kapangidwe ka maselo ndi ntchito yake kuti timvetsetse bwino nkhaniyi.
Funso 1: Kodi kapangidwe ka nembanemba ya selo kamathandizira bwanji ntchito yake yonyamula zinthu?
Kukambirana:
Nembanemba ya selo, yomwe imadziwikanso kuti nembanemba ya plasma, ndi kapangidwe kofunikira kwambiri pa maselo chifukwa kamalekanitsa mkati mwa selo ndi malo akunja. Nembanemba iyi imapangidwa ndi zigawo ziwiri za amphipathic phospholipids, zomwe zikutanthauza kuti molekyulu iliyonse ya phospholipid ili ndi mutu wokonda madzi (hydrophilic) ndi mchira woletsa madzi (hydrophobic). Kapangidwe kameneka kamalola nembanemba kupanga chotchinga chothandiza ku zinthu zosungunuka m'madzi (polar) koma kamalola gawo la lipid (nonpolar) kudutsa.
Mu kapangidwe ka nembanemba kameneka muli mapuloteni olowa mkati omwe amagwira ntchito yonyamula mamolekyu ndi ma ayoni. Pali mitundu iwiri ya zoyendera mkati mwa nembanemba ya selo: yopanda ntchito ndi yogwira ntchito. Kuyenda kosachita zinthu, kuphatikizapo kufalikira ndi osmosis, sikufuna mphamvu, pomwe kuyenda kosachita zinthu kumafuna mphamvu ya ATP kuti mamolekyu asunthe motsutsana ndi kuchuluka kwa mamolekyu.
Mapangidwe awa amathandizira ntchito zake zazikulu: kulamulira kulowa ndi kutuluka kwa zinthu mu selo, komanso kuteteza umphumphu wa selo mwa kusunga kapangidwe ka mkati kosalekeza.
Funso 2: N’chifukwa chiyani mitochondria ili ndi mapindidwe ambiri mu nembanemba yawo yamkati? Kodi izi zikugwirizana bwanji ndi ntchito yawo?
Kukambirana:
Mitochondria imadziwika kuti ndi "malo amphamvu" a maselo chifukwa ndi malo oyamba opangira adenosine triphosphate (ATP), molekyulu yomwe imakhala gwero lalikulu la mphamvu ya selo. Nembanemba yamkati ya mitochondrial ili ndi mapindidwe ambiri otchedwa cristae. Mapindidwe awa amawonjezera malo pamwamba pa nembanemba yamkati, zomwe ndizofunikira chifukwa apa ndi pomwe kupanga kwakukulu kwa ATP kumachitika.
Nembanemba yamkati ili ndi ma enzyme ambiri omwe amagwira ntchito mu unyolo woyendera ma electron ndi ATP synthase, yomwe imayambitsa phosphorylation ya oxidative kuti ipange ATP. Malo okulirapo a nembanemba, ma enzyme ambiri amatha kugwiritsidwa ntchito, motero kupanga ATP kumawonjezeka. Ichi ndi chitsanzo chabwino kwambiri cha momwe kapangidwe ka mitochondria kamathandizira ntchito yawo monga wopanga mphamvu wamkulu mu selo.
Funso 3: Kodi ntchito ya kapangidwe kapadera ka ma chloroplast ndi yotani pakupanga photosynthesis?
Kukambirana:
Ma chloroplast ndi ma organelle apadera omwe amapezeka m'maselo a zomera ndi algae omwe amagwira ntchito makamaka mu photosynthesis. Monga mitochondria, ma chloroplast ali ndi nembanemba iwiri; komabe, alinso ndi mapangidwe apadera otchedwa thylakoids, mapangidwe a nembanemba wooneka ngati disc omwe amakonzedwa m'magulu otchedwa grana.
Chlorophyll, utoto womwe umapangitsa kuti kuwala kwa dzuwa kulowe, umapezeka mu nembanemba ya thylakoid. Kuyika kumeneku ndikofunikira chifukwa kumathandiza kuti mphamvu ya kuwala igwire bwino kwambiri kuti pakhale photosynthesis. Munjira imeneyi, mphamvu ya kuwala imagwiritsidwa ntchito kusintha madzi ndi carbon dioxide kukhala mpweya ndi shuga.
Kapangidwe ka grana kolimba kamalola kuti kuwala kugwire bwino ntchito komanso kugwiritsidwa ntchito bwino. Kuphatikiza apo, nembanemba ya thylakoid ili ndi njira yotumizira ma electron yomwe imathandiza kupanga proton gradient yofunikira pakupanga ATP mu ma chloroplast, mofanana ndi momwe zimachitikira mu mitochondria.
Funso 4: Kodi kapangidwe ka cytoskeleton kamathandizira bwanji ntchito ya maselo?
Kukambirana:
Chigoba cha maselo ndi netiweki ya ulusi wa mapuloteni womwe umagawidwa mu cytoplasm ya selo. Chili ndi mitundu itatu ikuluikulu ya ulusi: ulusi waung'ono (wopangidwa ndi actin), ma microtubules, ndi ulusi wapakati. Zigawo zitatuzi zimagwira ntchito limodzi kuti zithandizire kapangidwe kake, kusunga mawonekedwe a selo, kulamulira kayendedwe ka selo, ndikuwongolera kayendedwe ka mkati mwa ma vesicles ndi organelles.
Mwachitsanzo, ma microtubules amathandiza kusunga kapangidwe ka maselo ndikuthandizira mitosis monga gawo la mitotic spindle. Ma microfilaments amathandiza kuyenda kwa maselo kudzera mu njira yochepetsera minofu yofanana ndi minofu, pomwe ma filaments apakati amapereka mphamvu yamakina yomwe imathandiza maselo kupirira kupsinjika.
Kudzera mu mgwirizano umenewu, cytoskeleton imakhudzidwanso ndi kutumiza mauthenga m'maselo, zomwe zimathandiza kulankhulana pakati pa maselo ndi mkati mwa maselo komwe ndikofunikira kwambiri pa ntchito zovuta kwambiri za minofu.
Kutseka
Kumvetsetsa ubale pakati pa kapangidwe ka maselo ndi ntchito yake ndikofunikira kwambiri pa sayansi ya maselo. Mwa kuwunika zitsanzo zenizeni za kapangidwe ka maselo monga nembanemba ya maselo, mitochondria, ma chloroplast, ndi cytoskeleton, titha kumvetsetsa bwino momwe gawo lililonse la selo limagwirira ntchito limodzi kuti lithandizire moyo. Mwa kudziwa bwino mfundo izi, titha kugwiritsa ntchito chidziwitsochi m'magawo monga mankhwala, sayansi ya zamoyo, ndi zachilengedwe. Tikupita patsogolo, pitirizani kufufuza ndikuphunzira zambiri za maselo, chifukwa ndi sitepe yofunika kwambiri pakumvetsetsa njira zosangalatsa za moyo.
