单词 | stop codon |
释义 | stop codonstop codonstop codonstop codon[′stäp ′kō‚dän]stop codonter·mi·na·tion co·donstop codonstop codonAny of the 3 codons (or triplets of nucleotides—UAA, UAG and UGA) on an mRNA molecule which lack a cognate aminoacyl tRNA—i.e., do not code for an amino acid and thus signal the end of protein synthesis. When ribosomes hit a stop codon, mRNA transcription is terminated, causing polypeptide synthesis to stop and the ribosome to dissociate from the mRNA.stop codonAny one of three nucleotide triplets which marks the end of every gene and indicates that protein synthesis ends at that point. The three stop codons are UAG (the amber codon), UAA and UGA. U is uracil, A is adenine and G is guanine.stop codonsee NONSENSE CODON. |
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