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Khorana first deciphered the triplet codons of

1. serine and isoleucine
2. cysteine and valine
3. tyrosine and tryptophan
4. phenylalanine and methionine

Correct answer: serine and isoleucine

Solution

Khorana’s experiments helped decode the genetic code by using synthetic RNA sequences to determine which triplets specified particular amino acids. Among the earliest codons he deciphered were those for serine and isoleucine.

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