Video: DNA tsim li cas?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
DNA yog tsim los ntawm chemical tsev blocks hu ua nucleotides. Ua ib txoj hlua ntawm DNA , nucleotides txuas rau hauv cov saw hlau, nrog cov phosphate thiab qab zib pawg hloov pauv. Plaub hom nitrogen hauv paus pom hauv nucleotides yog: adenine (A), thymine (T), guanine (G) thiab cytosine (C).
Raws li, DNA ua los ntawm dab tsi?
DNA yog ua nce ntawm molecules hu ua nucleotides. Txhua nucleotide muaj ib pawg phosphate, pawg suab thaj thiab nitrogen hauv paus. Plaub hom nitrogen hauv paus yog adenine (A), thymine (T), guanine (G) thiab cytosine (C). Qhov kev txiav txim ntawm cov hauv paus no yog qhov txiav txim siab DNA cov cov lus qhia, los yog genetic code.
Tsis tas li ntawd, DNA tuaj yeem tsim ib txwm muaj? DNA ua tau muaj nyob ntev ua ntej lub neej nws tus kheej. Qhov tseeb twist nyob rau hauv keeb kwm-ntawm-lub neej taleas yog ob helical. Chemists nyob ze rau ua qauv qhia tias lub tsev blocks ntawm DNA tuaj yeem tsim spontaneously los ntawm cov tshuaj xav tias muaj nyob rau hauv lub ntiaj teb primordial.
Ua raws li qhov no hauv kev txiav txim siab, DNA piav qhia dab tsi?
DNA , los yog deoxyribonucleic acid, yog cov khoom tsim los ntawm tib neeg thiab yuav luag txhua yam kab mob. Yuav luag txhua lub cell hauv tib neeg lub cev muaj tib yam DNA . Cov ntaub ntawv hauv DNA yog khaws cia raws li cov cai ua los ntawm plaub lub hauv paus tshuaj: adenine (A), guanine (G), cytosine (C), thiab thymine (T).
DNA luam li cas?
DNA replication yog tus txheej txheem uas DNA ua a luam ntawm nws tus kheej thaum lub sij hawm faib cell. Thawj kauj ruam hauv DNA replication yog mus 'unzip' ob chav helix qauv ntawm lub DNA ? molecule. Kev sib cais ntawm ob qho tib si strands ntawm DNA tsim ib 'Y' duab hu ua replication ' diav rawg'.
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