The first codon to be deciphered was which codes for

AAA, praline

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GGG, alanine

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UUU, phenylalanine

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TTT, arginine

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Solution

The correct option is C UUU, phenylalanine
Marshall Nirenberg deciphered the first codon in 1961 in his experiment where he found 64 codons which acts as genetic code and codes for amino acids. It was found to be UUU (Phenylalanine), he wanted to find out that codon which has only one type of base instead of four bases and codes for proteins of only one kind of amino acid.
So, the correct option is 'UUU, Phenylalanine'.

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