Which type of mutagen causes the most mutations in humans?
Chemical mutagens
Physical mutagens
Biological mutagens
All types cause the same number of mutations
Chemical mutagens are substances that cause changes in DNA by reacting with it, often by altering the chemical structure of the DNA molecule. These changes can include base substitutions, deletions, insertions, or rearrangements of DNA. Chemical mutagens can be found in environmental pollutants, industrial chemicals, drugs, and even some natural substances.
Physical mutagens, such as radiation, can also cause mutations in DNA by damaging its structure, but they are generally less frequent than chemical mutagens. Biological mutagens, such as viruses, can also introduce mutations into DNA, but they usually do so indirectly by altering the DNA replication machinery or by inducing an immune response that damages DNA.
Option a is the correct answer.