Do Epigenetic mutagens alter the DNA

Do Epigenetic mutagens alter the DNA

• A. Yes
• B. No
• C. Sometimes
• D. Not applicable

Answer: (B)

Epigenetic mutagens change how genes are expressed, not the actual DNA sequence. They alter epigenetic marks such as DNA methylation and histone modifications, which influence chromatin structure and transcriptional activity without changing the nucleotide letters. Because the genetic code itself remains unchanged, these agents are not mutating the DNA sequence, even though they can have lasting and heritable effects on gene expression. While they can modify epigenetic states, that chemical modification is different from a DNA sequence mutation, so the appropriate answer is that they do not alter the DNA.

Epigenetic mutagens change how genes are expressed, not the actual DNA sequence. They alter epigenetic marks such as DNA methylation and histone modifications, which influence chromatin structure and transcriptional activity without changing the nucleotide letters. Because the genetic code itself remains unchanged, these agents are not mutating the DNA sequence, even though they can have lasting and heritable effects on gene expression. While they can modify epigenetic states, that chemical modification is different from a DNA sequence mutation, so the appropriate answer is that they do not alter the DNA.