Multiple choice

Which of the following semiessential amino acids is encoded by six different codons in humans?

  1. Serine

  2. Leucine

  3. Arginine

  4. Tryptophan

  5. Methionine
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C Correct answer
Explanation

Arginine is an α-amino acid. At the level of molecular genetics, in the structure of the messenger ribonucleic acid mRNA, CGU, CGC, CGA, CGG, AGA, and AGG, are the triplets of nucleotide bases or codons that code for arginine during protein synthesis. In mammals, arginine is classified as a semiessential or conditionally essential amino acid, depending on the developmental stage and health status of the individual.

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