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Question

The sequence of an mRNA coding for a polypeptide with 50 amino acids has UAU as the 35th codon and AUG as the 26th codon. What will happen if the 25th codon gets mutated to UAA?

A
A polypeptide of 24 amino acids will be formed
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B
2 polypeptides of 24 and 25 amino acids will be formed.
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C
A polypeptide of 49 Amino acid will be formed.
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D
A polypeptide of 25 Amino acid will be formed.
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Solution

The correct option is A A polypeptide of 24 amino acids will be formed
UAA is stop codon.
An AUG at 26th position will not start the transcription again as promoter would be absent at its upstream.

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