Which of the following amino acids is specified by 4 codons?

Tyrosine (Tyr)

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Proline (Pro)

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Lysine (Lys)

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Methionine (Met)

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Solution

The correct option is D Proline (Pro)
Proline (Pro) amino acid is the amino acid which is specified by 4 mRNA codons; CCU, CCC, CCA, CCG. While methionine is specified by just one codon, the amino acids Lysine and Tyrosine are specified by two codons each. So, the correct answer is option B.

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