Question : DNA shows hyperchromicity on:
Option 1: heating
Option 2: cooling
Option 3: crystallizing
Option 4: replication
Correct Answer: heating
Solution : The correct option is heating.
When DNA is heated or denatured, it becomes hyperchromic. The absorption of UV light rises as the DNA strands split, owing to the breakage of hydrogen bonds between complementary base pairs, resulting in hyperchromicity.