How 20 amino acids are coded by 61 codons ? (only the underlined one)
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There are 20 amino acids that are normally used in proteins and which are translated. ... Thus 61 codons are available for 20 amino acids, and hence the genetic code is degenerate. In the case of leucine, serine, and arginine, there are as many as six codons, whereas methionine and tryptophan have only one codon.
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The genetic code is degenerate, or redundant. So, one amino acid can be coded for more than one codons. For example, threonine can be coded by four codons, ACU, ACC, ACA, and ACG. Besides, there are three codons, called the stop codons, who do not code for any amino acid.
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