A substance that can cause a change in the DNA code of an organism is a:

A substance that can cause a change in the DNA code of an organism is a:

• A. Mutagen
• B. Enzyme
• C. Protein
• D. Lipid

Answer: (A)

A mutagen is the term for a substance that can cause a change in the DNA code of an organism. Mutagens increase the likelihood of mutations by damaging DNA or causing misreading during replication, which can lead to base substitutions, insertions, or deletions. Examples include ultraviolet light that can form thymine dimers and certain chemicals that alkylate bases. This explains why mutagens fit the description in the question. Enzymes are proteins that catalyze reactions and do not inherently alter the DNA sequence, while lipids are not involved in changing DNA directly. So a mutagen is the best answer.

A mutagen is the term for a substance that can cause a change in the DNA code of an organism. Mutagens increase the likelihood of mutations by damaging DNA or causing misreading during replication, which can lead to base substitutions, insertions, or deletions. Examples include ultraviolet light that can form thymine dimers and certain chemicals that alkylate bases. This explains why mutagens fit the description in the question. Enzymes are proteins that catalyze reactions and do not inherently alter the DNA sequence, while lipids are not involved in changing DNA directly. So a mutagen is the best answer.