Multiple choice Which of the following form(s) DNA cross links to induce mutation? Ochratoxin A Psoralens Ethidium bromide Bromodeoxyuridine Reveal answer Fill a bubble to check yourself B Correct answer Explanation Psoralens are natural compounds (furocoumarins) present in plants. They form DNA cross links to induce mutation. The crosslinking reaction by psoralens targets TA sequences intercalating in DNA and linking one base of the DNA with the one below it.