Question

In mRNA strand having specific number of codons, if the 23^rd codon UUA is replaced by UAA, what will be the change found in synthesized polypeptide chain?

Options

• There will be no change in polypeptide chain.

• Protein synthesis will stop after 22^nd amino acid.

• Amino acid on 23^rd place will be change in polypeptide chain.

• None amongst these

Answer 1

Protein synthesis will stop after 22^nd amino acid.

Explanation:

Because UUA codes for the amino acid leucine, if UAA is substituted for UUA, protein synthesis will halt after leucine because UAA is a stop codon.