2024 Tus sau: Elizabeth Oswald | [email protected]. Kawg hloov kho: 2024-01-13 00:07
Codons yog tsim los ntawm ib qho triplet ua ke ntawm plaub lub hauv paus nitrogenous adenine (A), guanine (G), cytosine (C), lossis uracil (U). Ntawm 64 qhov ua tau ua ntu zus, 61 qhia txog 20 amino acids uas tsim cov proteins thiab peb yog cov cim qhia.
Yuav ua li cas yog lub codon ntawm DNA encoded?
Hloov chaw, plaub tsab ntawv sawv cev plaub tus neeg lub cev hu ua nucleotides: thymine (T), adenine (A), cytosine (C), thiab guanine (G). Qhov kev txiav txim los yog ib ntus ntawm cov hauv paus no tsim ib qho kev cai caj ces tshwj xeeb. Cov codon 'cov lus' hauv cov caj ces yog txhua peb lub nucleotides ntev -thiab muaj 64 ntawm lawv.
Puas yog codons ua hauv kev txhais lus?
Codons hauv an mRNA tau nyeem thaum lub sijhawm txhais lus, pib nrog pib codon thiab txuas ntxiv mus txog thaum nres codon. … Kev txhais lus suav nrog kev nyeem mRNA nucleotides hauv peb pawg; txhua pab pawg qhia txog cov amino acid (los yog muab lub teeb liab nres qhia tias kev txhais lus tiav lawm).
Vim li cas AUG ib txwm yog pib codon?
RNA rings code rau 21 amino acids thiab nres codon tom qab peb sib law liag sib txuas lus, thiab tsim ib tug degradation-delaying qia-voj hairpin. … RNA nplhaib tsim ua ntej AUG as pib codon. Qhov no tsuas yog piav qhia tsis tau rau AUG li pib codon.
4 kauj ruam ntawm kev txhais lus yog dab tsi?
Kev txhais lus tshwm sim hauv plaub theem: ua kom (npaj txhij), pib (pib), elongation (ua kom ntev) thiabtermination (stop). Cov ntsiab lus no piav qhia txog kev loj hlob ntawm cov amino acid saw (polypeptide). Amino acids raug coj mus rau ribosomes thiab sib sau ua ke rau hauv cov protein.
Pom zoo:
Yuav ua li cas sau ntawv thiab yuav ua li cas?
Tab sis tiag tiag, sau ntawv tsuas yog txhais tau tias tso tseg me ntsis nyob ntsiag to, tsis muaj sijhawm los zaum thiab xav txog koj lub neej. Nws tuaj yeem yog los ntawm kev sau cov ntaub ntawv ntawm qhov koj tau ua hnub ntawd; los ntawm venting txog ib yam uas koj tsis tuaj yeem tawm ntawm koj lub siab;
Nyob hauv mrna txhua codon qhia ib qho tshwj xeeb?
Txhua pawg ntawm peb lub hauv paus hauv mRNA tsim ib codon, thiab txhua tus codon qhia meej ib qho amino acid (li no, nws yog triplet code). Lub mRNA ib ntus yog li siv los ua tus qauv los sib sau ua ke-hauv kev txiav txim-cov saw ntawm cov amino acids uas tsim cov protein.
Lub sijhawm txhais lus lub codon ntawm mrna yog 'nyeem' los ntawm?
Hauv kev txhais lus, cov codons ntawm mRNA tau nyeem nyob rau hauv kev txiav txim (los ntawm 5' kawg mus rau 3' kawg) los ntawm molecules hu ua hloov RNAs, lossis tRNAs. Txhua tRNA muaj cov tshuaj tiv thaiv kab mob, ib txheej ntawm peb nucleotides uas khi rau qhov sib txuam mRNA codon los ntawm kev sib koom ua ke.
Lub sijhawm hloov pauv hloov pauv yog qhov nres codon mus txog?
Cov ntaub ntawv caj ces nqa hauv codons ntawm mRNA tam sim no tau nyeem (decoded) los ntawm anticodons ntawm tRNA. Raws li txhua tus codon (triplet) tau nyeem, cov amino acids tau koom ua ke kom txog thaum lub codon nres (UAG, UGA lossis UAA) mus txog.
Puas muaj ib seem uas khi rau ib codon?
Txhua tRNA molecule muaj ob qhov sib txawv, ib qho uas khi rau ib qho amino acid tshwj xeeb, thiab lwm yam uas khi rau ib qho tshwj xeeb codon hauv mRNA ib ntus vim nws nqa cov nucleotides hu ua anticodon (Daim duab 3). Yuav ua li cas khi rau codon?
