Question

Different types of mutations can occur in DNA. The diagram represents a type of mutation.


Which statement describes the mutation in the diagram?
Select {responseValue}
A substitution occurs with the adenine base.
Select {responseValue}
A deletion of a cytosine base occurs.
Select {responseValue}
A base is inserted into one strand of the DNA.
Select {responseValue}
A silent mutation results in the insertion of a different amino acid.

Answer 1

A base is inserted into one strand of the DNA.

Explanation: the diagram shows an extra nucleotide added (a bulge/insertion) in one strand. That is an insertion mutation (frameshift). A substitution would replace one base with another, a deletion would remove a base, and a silent mutation does not change the amino acid (so the given description is incorrect).