Which one of the following pairs are correctly matched with regard to the codon and the amino acid coded by them?

UUA - Valine

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AAA - Lysine

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AUG - Cysteine

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CCC - Alanine

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Solution

The correct option is B AAA - Lysine
A set of three nucleotide bases specify particular amino acid; the set is called as triplet codon. The triplet "UUA" codes for leucine while valine is encoded by GUA, GUG, GUC, GUU; option A is wrong. The triplet "AAA" codes for lysine; option B is right. The triplet "AUG" codes for methionine while cysteine is encoded by UGU and UGC; option C is wrong. The triplet "CCC" codes for proline while alanine is encoded by GCA, GCC, GCG, GCU; option D is wrong.

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