Multiple choice The mutagen ethidium bromide acts as a Deaminating agent Intercalating agent Alkylating agent Base analogue Reveal answer Fill a bubble to check yourself B Correct answer Explanation Ethidium bromide is a planar molecule that inserts itself between adjacent base pairs in the double helix of DNA, acting as a classic intercalating agent. This distorts the DNA helix and can cause frameshift mutations during replication.