Question

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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

I don't see the diagram — could you upload it or describe exactly what changed (which base(s) are different, added, or missing)?

How to decide from the diagram:
- If one base is missing from the sequence → choose "A deletion of a cytosine base occurs." (or “a deletion” if a different base is missing).
- If an extra base is shown inserted into one strand → choose "A base is inserted into one strand of the DNA."
- If one base is replaced by a different base (no bases added or removed) → choose "A substitution occurs with the adenine base" if the changed base is adenine, otherwise choose the substitution option that names the base shown.
- The last option is incorrect because a silent mutation does NOT insert a different amino acid; a silent mutation changes a codon but still codes for the same amino acid.

Send the image or describe the change and I’ll pick the correct option for you.