Question

Nonsense suppressor mutation is found in _________.

• A. rRNA
• B. tRNA
• C. start codon of mRNA
• D. stop codon of mRNA

Hint:

Nonsense suppressor mutations involve tRNA molecules that can bypass stop codons, allowing translation to continue.

Answer 1

The Correct Option is B

Step 1: Understanding the concept.
A nonsense suppressor mutation is a type of mutation in tRNA. It involves the modification of the tRNA molecule to allow it to read a premature stop codon as if it were a codon for an amino acid, effectively suppressing the effect of a nonsense mutation in the mRNA.
Step 2: Analyzing the options.
- (A) Incorrect, as rRNA does not play a direct role in suppressing stop codons.
- (B) Correct, as tRNA can suppress the effect of stop codons by inserting the correct amino acid during translation.
- (C) Incorrect, as the start codon is involved in initiation, not in suppressing stop codons.
- (D) Incorrect, as the stop codon itself is typically the site of termination, not the site of suppression.
Step 3: Conclusion.
Thus, the correct answer is (B) tRNA.