Question

Suppose during transcription of the DNA code AAA, a mistake occurs, due to which the UUG code of mRNA is formed. Due to this, what change in picking the types of amino acid would occur during the synthesis of protein?

Answer 1

If the original DNA code is AAA, the transcription process should normally produce the mRNA codon UUU, which specifies the amino acid phenylalanine. However, if a transcription error results in the formation of UUG, the ribosome will instead incorporate the amino acid leucine into the growing polypeptide chain. This substitution of leucine for phenylalanine represents a missense mutation, which could potentially alter the protein's final structure or biological activity depending on the importance of that specific position.