Question

A DNA molecule has the sequence CAT CAT CAT. If a guanine base is added at the beginning of the sequence, which of the following would be the most appropriate option?

• A. G UAT CAT CAT
• B. GCA TCA TCA T
• C. Frame shift mutation
• D. Both B and C

Answer 1

Answer: (D)

Both B and C

The DNA molecule has the sequence as CAT CAT CAT earlier. If a guanine base is added at the beginning of the sequence, the sequence will be GCA TCA TCA T. This is an example of the frame shift mutation in which the reading frame changes due to the insertion of a new nucleotide in the sequence.

Thus, the correct answer is option D.