Question

An error in the polypeptide chain produced from DNA sequence is not always the result of mutation. The best explanation for this is that

• A. Some polypeptides are produced by a code other than a nucleic acid code
• B. The nucleolus can repair damaged DNA
• C. The Golgi body can repair damaged DNA
• D. Different codons code for the same amino acid
• E. Scientists have no idea why this phenomenon occurs

Answer 1

The correct option is D Different codons code for the same amino acid

A mutation causing the no change in the amino acid and hence no effect on the function of the protein is called as a silent mutation. If point mutation alters the base of a codon in such a way that the altered codon also codes for same amino acid; the will not be any mutation. This is due to the degeneracy of genetic code that allows one amino acid to be encoded by multiple codons. The correct answer is D.