Txhua 3 tsab ntawv ntawm DNA strand code yog dab tsi?
Txhua 3 tsab ntawv ntawm DNA strand code yog dab tsi?

Video: Txhua 3 tsab ntawv ntawm DNA strand code yog dab tsi?

Video: Txhua 3 tsab ntawv ntawm DNA strand code yog dab tsi?
Video: Xav rov ntsib koj ib zaug dua. 8/8/2018 2024, Kaum ib hlis
Anonim

Cov no yog "niam ntawv" ntawm ntawv uas yog siv los sau " code lus". code muaj ib ntus ntawm peb tsab ntawv "cov lus" (qee zaus hu ua 'triplelets', qee zaum hu ua 'codons'), sau ib qho tom qab lwm raws qhov ntev ntawm lub DNA strand . Tag nrho lwm cov kab ke code rau cov amino acids tshwj xeeb.

Kuj nug, peb tsab ntawv code hauv DNA hu ua dab tsi?

Cov caj ces code yuav tsum yog "lus" - siv cov DNA Cov tsiaj ntawv ntawm A, T, C, thiab G - uas tsim txaus DNA "cov lus" qhia txhua tus ntawm 20 paub cov amino acids. Kev khiav hauj lwm ntawm lub hauv paus ntsiab lus uas qhov kev daws teeb meem yooj yim feem ntau yog qhov tseeb, cov kws tshawb fawb tau xav tias a peb - tsab ntawv code hu ua ib codon.

Ib tug kuj yuav nug, cov ntawv dab tsi mus nrog dab tsi hauv DNA? Hauv DNA, cov ntawv cim yog A, T, G, thiab C, uas sawv cev rau cov tshuaj adenine , thymine, guanine, thiab cytosine, feem. Hauv kev sib piv, adenine ib txwm ua khub nrog thymine, thiab guanine ib txwm ua khub nrog cytosine.

Hais txog qhov no, lub codon code rau dab tsi?

caj ces code …ib lub npe hu ua codon , qho codes rau ib qho amino acid. Piv txwv li, cov kab ke AUG yog a codon uas qhia txog cov amino acid methionine. Muaj 64 qhov ua tau codons , peb cov ua tsis yog code rau amino acids tab sis qhia qhov kawg ntawm cov protein.

Muaj pes tsawg amino acids ua ib txoj kab ntawm DNA code rau?

Koj tuaj yeem xav txog cov kab ke ntawm cov hauv paus hauv coding strand ntawm DNA lossis hauv tub txib RNA raws li cov lus qhia rau kev tsim cov protein chains tawm ntawm cov amino acids. Muaj 20 amino acids siv los ua cov protein, tab sis tsuas yog plaub lub hauv paus sib txawv los siv los ua cov cai rau lawv.

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