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.
mRNA codons nyeem los ntawm dab tsi?
Thaum kev txhais lus, ib ntu mRNA tau nyeem siv tus kab mob caj ces, uas yog cov txheej txheem uas txhais tau li cas mRNA ib ntus yuav tsum tau muab txhais ua 20 tsab ntawv code ntawm cov amino acids, uas yog lub tsev blocks ntawm cov proteins.
mRNA nyeem hauv kev txhais li cas?
Txhua mRNAs tau nyeem hauv the 5' mus rau 3' kev taw qhia, thiab cov saw hlau polypeptide tau tsim los ntawm cov amino mus rau carboxy terminus. Txhua cov amino acid tau teev los ntawm peb lub hauv paus (ib codon) hauv mRNA, raws li txoj cai ze li ntawm universal genetic code.
mRNA codon ua dab tsi hauv kev txhais lus?
mRNA codons tau nyeem los ntawm 5' mus rau 3', thiab lawv qhia qhov kev txiav txim ntawm amino acids hauvprotein ntawm N-terminus (methionine) mus rau C-terminus. Kev txhais lus suav nrog kev nyeem cov mRNA nucleotides hauv pawg ntawm peb; txhua pab pawg qhia txog cov amino acid (los yog muab lub teeb liab nres qhia tias kev txhais lus tiav lawm).
mRNA codon yog dab tsi thiab lawv nyeem dab tsi?
Genetic code
Thaum kev sau ntawv, RNA polymerase nyeem cov qauv DNAstrand nyob rau hauv lub 3′→ 5′ kev taw qhia, tab sis lub mRNA yog tsim nyob rau hauv lub 5′ rau 3′ kev taw qhia. … Cov codons ntawm mRNA nyeem ntawv yog txhais nyob rau hauv lub 5′→3′ kev taw qhia rau hauv cov amino acids los ntawm ib tug ribosome los tsim ib tug polypeptide saw.
