Which of the following is a stop codon?

UAG

The correct answer is Option (2)- UAG

The process of genetic information transfer involves mRNA carrying instructions from the nucleus to the cytosol. This mRNA comprises codons, sequences derived from DNA, which are read by the ribosome during translation.

Codons are triplets composed of three bases and serve as the blueprint for the synthesis of a polypeptide chain. Within these codons, there are start and stop codons. The start codon, AUG, initiates the translation process and typically resides at the 5' end of the mRNA sequence. On the other hand, stop codons, UAA, UGA, and UAG, facilitate termination of the polypeptide chain. These termination codons are positioned at the 3' end of mRNA.