Three examples of mutagens include the chemicals bromouracil, aminopurine and nitrous acid. All three of these chemicals may alter the structure of DNA and cause genetic changes in individuals.
Mutagens are natural or human-made agents that have the ability to alter the structure or the sequence of human DNA. They cause mutations to occur within the cells of humans and can be very detrimental to a person's health. Bromouracil and aminopurine are both mutagens that appear chemically similar to DNA base pairs. For this reason they are able to insert themselves into DNA sequences and cause mutations. Nitrous acid is formed in the body after digesting nitrates. It can alter the structure and the pairing properties of DNA bases.