Question

In a given DNA segment ATG ACC ACG ACC CCA ACA, the first base gets mutated. The effect of this on coding by this DNA segment will result in

• A. A complete change in the type as well as sequence of amino acids.
• B. Change in the first amino acid only.
• C. No change in the sequence.
• D. One amino acid less in the protein.
• E. No coding occurs.

Answer 1

Answer: (B)

Change in the first amino acid only.

Mutation in single nucleotide base of a DNA segment is called as point mutation. The change in first base of the sequence will alter the first amino acid only, the type of the following amino acids will remain same. Hence, the correct answer is 'Change in the first amino acid only'.