Mibvunzo yemuenzaniso pamusoro peDNA neMajini
Pendauluan
Mubiology yemamorekuru, DNA (Deoxyribonucleic Acid) nemajini ipfungwa huru dzinotsigira kunzwisisa nhaka yehunhu uye mashandiro ezvipenyu. DNA imorekuru inochengetedza ruzivo rwese rwemajini runodiwa kuti igadzirise chimiro nekushanda kwechipenyu. Majini, kune rumwe rutivi, zvikamu zveDNA zvinonyora mapuroteni chaiwo kana RNA. Kunzwisisa DNA nemajini kwakakosha kune chero ani zvake anofarira biology, biotechnology, mushonga, uye minda ine chekuita nayo. Chinyorwa chino chichakurukura mimwe mibvunzo inowanzo bvunzwa ine chekuita nemisoro iyi, pamwe chete netsananguro dzayo.
1. Mubvunzo 1: Maumbirwo eDNA
Mubvunzo: Tsanangura chimiro cheDNA chine denderedzwa repiri uye taura zvinhu zvikuru zvinoiumba.
Kukurukurirana: DNA idenderedzwa remaviri, zvichireva kuti ine tambo mbiri dzakatenderedzana, dzakafanana nematanho anotenderera. Chimiro ichi chakatanga kurongwa naJames Watson naFrancis Crick muna 1953, avo vakahwinawo Nobel Prize nekuda kwekuwanikwa kwavo. DNA inoumbwa nezvinhu zvitatu zvikuru: phosphate, deoxyribose shuga, uye nitrogenous bases. Aya mabhesi ane nitrogenous ndiadenine (A), thymine (T), cytosine (C), uye guanine (G). Mudenderedzwa remaviri, mabhesi aya anobatanidzwa zvakananga: A pairs ane T kuburikidza nehydrogen bonds mbiri, uye C pairs ane G kuburikidza nehydrogen bonds nhatu. Tambo dzeDNA ladder dzinomiririrwa neshuga nephosphate, nepo mapuranga achimiririrwa nebase pairs.
2. Mubvunzo 2: Kudzokororwa kweDNA
Mubvunzo: Zvinorevei kudzokororwa kweDNA semiconservative, uye nei zvichikosha?
Kukurukurirana: Kudzokorora DNA nenzira ye semiconservative inzira iyo molekyuru yega yega yeDNA itsva inoumbwa netambo imwe chete yekutanga netambo imwe itsva. Kana DNA ikadzokorora, double helix inoputsika se zipper, uye tambo yega yega yekutanga inoshanda se template yekugadzira tambo itsva. Maitiro aya akakosha nekuti anoita kuti sero rega rega riwane tambo imwe chete yeDNA yakafanana netambo yekutanga, ichichengetedza ruzivo rwemajini kuburikidza nezvizvarwa. Kudzokorora DNA nenzira ye semiconservative kunobatsira kuderedza zvikanganiso panguva yekupatsanurwa kwemasero uye kwakakosha pakugara nhaka kwemajini kwakarurama.
3. Mubvunzo 3: Kuonekwa kweMajini
Mubvunzo: Maitiro ekunyora uye kushandura anoitika sei mukutaura kwemajini?
Kukurukurirana: Kutaurwa kwemajini kunosanganisira matanho maviri makuru: kunyorwa uye kushandurwa. Mukunyora, chikamu cheDNA chine jini rakati chinoshandiswa se template yekugadzira messenger RNA (mRNA). Maitiro aya anoitika mu cell nucleus uye anosanganisira enzyme RNA polymerase, iyo inosunga kuDNA uye inounganidza mRNA zvichibva pane DNA base sequence. Mushure mekunyora, mRNA inobva mu nucleus yoenda ku ribosomes iri mu cytoplasm, uko kushandurwa kunoitika.
Munguva yekushandura, ma ribosomes anoverenga mRNA base sequence mumapoka matatu anonzi ma codons. Kodhoni yega yega ine amino acid chaiyo. Transfer RNA (tRNA) inotakura ma amino acids anoenderana nayo kuenda ku ribosome, iyo yozoaunganidza kuita polypeptide chain zvichibva pane codon sequence. Kana polypeptide chain yapera, inogadziriswazve kuti ive protein inoshanda inoita basa rakakosha musero.
4. Mubvunzo 4: Kuchinja kwemajini
Mubvunzo: Chii chinorehwa nekuchinja kwemajini, uye kuchinja kwemajini kunogona sei kukanganisa zvipenyu?
Kukurukurirana: Kuchinja kwemajini kuchinja kweDNA. Kuchinja uku kunogona kuitika pasina chikonzero panguva yekudzokororwa kweDNA kana kukonzerwa nezvinhu zvekunze zvakaita semwaranzi uye makemikari anochinja. Kuchinja kwemajini kunogona kukanganisa zvipenyu nenzira dzakasiyana-siyana, zvichienderana nerudzi nenzvimbo yekuchinja.
Kuchinja-chinja kwemasero kunogona kupatsanurwa kuita mhando nhatu huru:
– Kuchinja kwemapoinzi: kunosanganisira kuchinja mu nucleotide imwe chete. Izvi zvinogona kuitika nenzira yekutsiva (kutsiva imwe hwaro neimwe), kuisa, kana kubvisa.
– Kuchinja kweMissense: kunoguma nekutsiviwa kweamino acid imwe chete muprotein.
– Kuchinja-chinja kusina musoro: kugadzira ma codons anomira nguva isati yakwana, zvichimisa kugadzirwa kwemapuroteni nekukurumidza.
- Kuchinja kweFrameshift: kunokonzerwa nekuiswa kana kubviswa kwezvinhu zvinoshandura furemu yekuverenga mRNA.
Kukanganisa kwekuchinja kwemuviri kunogona kusiyana. Mamwe machinjiko haana simba (kuchinja kwemuviri kusingaonekwe), nepo mamwe achigona kukanganisa mashandiro emapuroteni, kukonzera zvirwere zvemajini, kana, mune zvisingawanzoitiki, kupa mukana wekushanduka-shanduka kwemuviri.
5. Mubvunzo 5: Kushandiswa kweBiotechnology neRecombinant DNA
Mubvunzo: Tsanangura kuti tekinoroji yeDNA inosanganiswa inogona kushandiswa sei mukugadzira zvirimwa zvisingaurayi zvipembenene.
Kukurukurirana: Tekinoroji yeDNA recombinant inosanganisira kusanganisa majini anobva kuzvinhu zvipenyu zvakasiyana kuti agadzire zvinhu zvipenyu zvine hunhu hutsva, hunodiwa. Mukukura kwezvirimwa zvisingaurayi zvipembenene, majini anoumba mapuroteni anouraya zvipembenene kana kudzivirira kukura kwawo anogona kutorwa kubva kumabhakitiriya oiswa mugenome yezvirimwa.
Semuenzaniso, Bacillus thuringiensis (Bt) ibhakitiriya rinogadzira puroteni ine chepfu kune zvimwe zvipembenene. Jini rinobatanidza puroteni yeBt rinogona kuparadzaniswa uye kuiswa muDNA yezvirimwa uchishandisa tekinoroji yeDNA recombinant. Chirimwa cheBt chinobuda chinogadzira puroteni yaro uye chinogona kuzvidzivirira kubva mukurwiswa nezvipembenene pasina kudiwa kwemishonga yekuuraya zvipembenene yemakemikari. Izvi hazvingowedzera kubereka kwezvirimwa chete asiwo zvinoderedza kukanganisa kwekushandiswa kwemishonga yekuuraya zvipembenene munzvimbo dzakatipoteredza.
Kuvhara
Kunzwisisa DNA nemajini hakungokoshi kune avo vanoshanda mubiology nemushonga chete, asiwo kune veruzhinji, tichifunga nezvekukosha kwazvo kune biotechnology nehupenyu hwedu hwezuva nezuva. Nekuongorora mienzaniso yematambudziko nehurukuro, tinovimba kuti izvi zvinopa nzwisiso yakadzama pamusoro penyaya iyi inokosha. Tinokutendai nekutevera, uye tinovimba kuti izvi zvave zvichibatsira.
