Mienzaniso yeMibvunzo yeKukurukura nezveDNA Molecular Model naWatson naCrick
Muna 1953, James D. Watson naFrancis H.C. Crick vakashamisa nyika yesainzi nekuburitsa kwavo chimiro chemamorekuru eDNA. Kuburitswa uku kwechimiro che double helix kwakapa hwaro hwekunzwisisa mashandiro enhaka yemagene uye kwakagadzira nzira yekufambira mberi kunoshamisa mumagene emazuva ano. Pepa rino richaongorora mienzaniso ine chekuita nemuenzaniso waWatson naCrick weDNA molecule uye richakurukura zvazvinoreva kubiology yemamorekuru uye tekinoroji yemagene.
Nhanganyaya kuDNA
DNA, kana kuti deoxyribonucleic acid, ndiyo molecule inochengeta ruzivo rwemajini mumasero ezvisikwa zvese zvipenyu, kusanganisira vanhu. Chaizvoizvo, DNA inoumbwa kuita cheni refu dzakagadzirwa nemayuniti anozivikanwa senucleotides. Nucleotide yega yega ine zvikamu zvitatu: boka rephosphate, deoxyribose shuga, uye imwe yezvikamu zvina zvakasiyana zvenitrogenous—adenine (A), thymine (T), guanine (G), uye cytosine (C).
Modhi yeWatson naCrick yeDouble Helix
Watson naCrick vakataura kuti DNA ine tambo mbiri dzepolynucleotide dzinoumba chimiro che double helix. Tambo idzi dzinofamba munzira dzakasiyana (antiparallel) uye dzakabatana ne base pairs pakati pe adenine ne thymine, uye pakati pe guanine ne cytosine. Ma base aya akabatana ne hydrogen bonds: hydrogen bonds mbiri dzinobatanidza A na T, nepo hydrogen bonds nhatu dzichibatanidza G na C. Ukama uhwu hwe base pairing hunotsanangura mutemo waChargaff, unoti nhamba yeA muDNA ichaenzana nenhamba yeT uye nhamba yeG ichaenzana nenhamba yeC.
Mibvunzo yemuenzaniso nehurukuro
Mubvunzo 1: Ndezvipi zvikamu zvikuru zveDNA uye kutevedzana kwezvikamu zvepasi kunogona sei kukanganisa mashandiro emajini?
Kukurukurirana: Zvikamu zvikuru zveDNA manucleotides, ane deoxyribose sugar, phosphate group, uye mana nitrogenous bases: adenine (A), thymine (T), guanine (G), uye cytosine (C). Kutevedzana kwakanangana kweaya ma base pairs kunoumba gene, inova chikamu cheDNA chinoratidza protein kana RNA molecule ine basa rayo. Kusiyana mu base sequence kunobvumira kupatsanurwa kweruzivo rwema genetic rwakakosha pamabasa akasiyana e biological. Semuenzaniso, shanduko kana shanduko mu base sequence mu gene zvinogona kukonzera kukanganisika kwe protein uye kukonzera zvirwere zvema genetic.
Mubvunzo 2: Tsanangura kuti kubatana kwebase kwakabatana kunoita sei kuti DNA irambe ichibatanidzwa zvakanaka.
Kukurukurirana: Kubatana kwebase pakati peAT neGC kunoita kuti DNA tambo yega yega ikwanise kushanda se template yekugadzira tambo yekuwedzera panguva yekudzokororwa. Enzyme DNA polymerase inoverenga base sequence iri patemplate strand uye inowedzera complementary nucleotides kune tambo itsva yakagadzirwa. Semuenzaniso, kana template strand ine sequence AGCT, tambo itsva yakagadzirwa complementary ichave ne sequence TCGA. Maitiro aya akakosha pakudzokororwa kweDNA kwakarurama kuitira kuti sero rega rega remwanasikana riwane ruzivo rwakafanana rwemajini kubva kuseri remubereki.
Mubvunzo 3: Zvakawanikwa naWatson naCrick zvakakanganisa sei nyaya ye biotechnology?
Kukurukurirana: Kuwanikwa kwaWatson naCrick kwechimiro cheDNA chine helix kaviri kwakaratidza kutanga kwechinjo mu biotechnology. Chimwe chinhu chakakosha chaive kukura kwehunyanzvi hwekugadzira majini, kusanganisira tekinoroji yeDNA yakagadziriswazve, iyo inobvumira kuiswa, kubviswa, kana kugadziriswa kwemajini chaiwo. Izvi zvakaita kuti pave nemashandisirwo akawanda anoshanda, akadai sekugadzirwa kwezvirimwa zvinopinda muropa zvinoramba zvipembenene, kugadzirwa kwe insulin yakagadziriswazve yekurapa chirwere cheshuga, uye kurapwa kwemajini ekurapa zvirwere zvemajini. Uyezve, ruzivo rwechimiro cheDNA nebasa zvakabatsirawo mukuvandudzwa kwenzira dzekuongorora chirwere nenzira yakarurama kuburikidza nepurojekiti ye genome yevanhu.
Mhedziso
Muenzaniso weDNA waWatson naCrick hauna kungotsanangura nzira huru dzekugara nhaka kwemajini chete asiwo wakavhura nzira itsva dzekutsvaga kwesainzi uye mashandisirwo epamusoro ebiotechnology. Kunzwisisa uku kunotibatsira kunzwisisa kuti ruzivo rwemajini runogadzirwa sei, runopfuudzwa sei, uye runopfuudzwa sei kubva kune chimwe chizvarwa kuenda kune chinotevera, pamwe nekuti shanduko padanho remajini dzinogona sei kukanganisa chipenyu chose. Panyaya yetekinoroji, kufambira mberi uku kwakabatsira mukuvandudzwa kwakawanda kwezvekurapa nezvekurima kwakabatsira zvikuru pahupenyu hwevanhu.
Mukupedzisa hurukuro iyi, zviri pachena kuti kuwanikwa kwaWatson naCrick kwechimiro cheDNA kwaipfuura kungobudirira mumunda we molecular biology; kwaive nzira yekusvika kunguva ye biotechnology iyo nhasi inoramba ichipa mikana yakawanda yekufambira mberi kwesainzi uye kuvandudzwa kwemhando yehupenyu.
