KCET · BIOLOGY · STD 12 - 5. Molecular Basis of Inheritance
In 125 amino acid sequence if the codon for 25th amino acid is mutated to UAA, then
- A a polypeptide of 24 amino acids is formed
- B a polypeptide of 124 amino acids is formed
- C no polypeptides are formed
- D a polypeptides of 25 amino acids is formed
Answer & Solution
Correct Answer
(A) a polypeptide of 24 amino acids is formed
Step-by-step Solution
Detailed explanation
(A) a polypeptide of 24 amino acids is formed,
UAA is one of the three stop codons which do not code for any amino acid. If the codon for \(25^{\text {th }}\) amino acid is mutated to UAA then the polypeptide chain will be terminated at that point because tRNA cannot bring next amino acid as UAA is termination codon. So, in this case a polypeptide chain of 24 amino acids will be formed.
UAA is one of the three stop codons which do not code for any amino acid. If the codon for \(25^{\text {th }}\) amino acid is mutated to UAA then the polypeptide chain will be terminated at that point because tRNA cannot bring next amino acid as UAA is termination codon. So, in this case a polypeptide chain of 24 amino acids will be formed.
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