Question

Gargi constructed m-RNA in laboratory. Which of the following codons will she have as initiating and terminating the m-RNA respectively?

• A. AUG–UAG
• B. GUG–UAC
• C. UAC–AUG
• D. AUG–UCA

Hint:

{Start codon = AUG; Stop codons = UAA, UAG, UGA}.

Answer 1

The Correct Option is A

Step 1: Understanding start and stop codons.
Protein synthesis begins at a specific start codon and ends at a stop codon on m-RNA.

Step 2: Identifying correct codons.
AUG is the universal initiation codon coding for methionine.
UAG is one of the three termination (stop) codons.

Step 3: Conclusion.
Thus, the initiating and terminating codons are AUG–UAG.