A mutagen that inserts between the stacked bases of a DNA double helix,distorting the DNA to induce single-pair insertions or deletions is called a(n)__________ agent.

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A mutagen that inserts between the stacked bases of a DNA double helix is called an intercalating agent. This type of mutagen distorts the DNA and induces single-pair insertions or deletions by pushing the adjacent base pairs apart, causing the DNA to unwind and potentially leading to errors during replication or transcription. Examples of intercalating agents include ethidium bromide and acridine dyes.

A Mutagen That Inserts Between the Stacked Bases of a DNA