What term describes a chemical or physical agent that interacts with DNA and causes a mutation?

What term describes a chemical or physical agent that interacts with DNA and causes a mutation?

• A. Carcinogen
• B. Enzyme
• C. Nucleosome
• D. Mutagen

Answer: (D)

Mutagens are agents that raise the rate of mutations by directly altering DNA or interfering with its replication. They can be physical, like UV light or X-rays, or chemical, such as certain reactive chemicals that modify bases. The damage they cause can lead to base substitutions, insertions, deletions, or cross-links, which, if replicated, become mutations in daughter cells. Enzymes are not mutation‑causing by definition; nucleosomes are DNA packaging units, not mutagens; carcinogens are cancer-causing agents and may be mutagenic, but the specific term for an agent that directly causes mutations is mutagen.

Mutagens are agents that raise the rate of mutations by directly altering DNA or interfering with its replication. They can be physical, like UV light or X-rays, or chemical, such as certain reactive chemicals that modify bases. The damage they cause can lead to base substitutions, insertions, deletions, or cross-links, which, if replicated, become mutations in daughter cells. Enzymes are not mutation‑causing by definition; nucleosomes are DNA packaging units, not mutagens; carcinogens are cancer-causing agents and may be mutagenic, but the specific term for an agent that directly causes mutations is mutagen.