Multiple choice

What would happen if in a gene encoding a polypeptide of 100 amino acids, the 83rd codon (UAC) is mutated to UAG?

  1. A polypeptide of 99 amino acids will form.

  2. A polypeptide of 83 amino acids will form.

  3. A polypeptide of 82 amino acid will form.

  4. A polypeptide of 17 amino acids will form.

  5. Two polypeptides of 83 and 17 amino acids respectively will form.
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C Correct answer
Explanation

A polypeptide of 82 amino acid will form. As UAG is a stop codon, it will not attach with any anticodon loop of tRNAbecause polypeptide elongation will be stopped at the 83rd position. Therefore, polypeptide chain with 82 amino acids will form.

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