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,例如, GUU, GUA都編碼纈氨酸 (編碼甲硫氨酸)為起始密碼子,翻譯從此密碼子開始,少數(shù)起始密碼子為 GUG ,UAG,UGA(終止密碼子,不編碼任何氨基酸),翻譯到次終止 AUG,GUG(起始密碼子) UAA,UAG,UGA(終止密碼子) codon decides one amino acid一個(gè)密碼子決定一個(gè)氨基酸 4. one amino acid may have many codons一個(gè)氨基酸可有多個(gè)密碼子 U C A U G A U U A Protein synthesis occurs in three stages: Initiation, Elongation and Termination.(蛋白質(zhì)的合成包括三個(gè)步驟:起始,延長(zhǎng),終止 ) 1. Initiation(起始 ) mRNA attaches to the ribosome.(mRNA與核糖體結(jié)合) A set of three nucleotide bases on a tRNA molecule is called an anticodon(反密碼) A A U Leucine DNA bases=RNA base =3 amino acid Questions the DNA strand