Question

dna mutations
quiz complete
a mutagen is
o a living thing that has undergone a mutation.
o an agent that causes a mutation in dna.
o a mutation that has affected one gene.
o any chemical that can poison living cells.
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Explanation:

A mutagen is defined as an agent (which can be chemical, physical like radiation, etc.) that causes a change (mutation) in the DNA sequence. A living thing that has undergone a mutation is a mutant. A mutation affecting one gene is just a description of a type of mutation. And any chemical that can poison living cells is a general toxic chemical, not specifically related to causing DNA mutations.

Answer:

an agent that causes a mutation in DNA.