Final answer:
When DNA is denatured, hydrogen bonds are broken. Denaturation is the process of separating the two strands of the DNA double helix by breaking the hydrogen bonds between the complementary bases.
Step-by-step explanation:
When DNA is denatured, hydrogen bonds are broken. Denaturation is the process of separating the two strands of the DNA double helix by breaking the hydrogen bonds between the complementary bases. This can occur through exposure to high temperatures or certain chemicals. The separated strands can then be renatured or reannealed by cooling or removing the denaturants, allowing the hydrogen bonds to reform.