AP BIOLOGY

Detailed explanation-1: -DNA helicases are molecular motors. Through conformational changes caused by ATP hydrolysis and binding, they move along the template double helix, break the hydrogen bonds between the two strands and separate the template chains, so that the genetic information can be accessed.

Detailed explanation-2: -The nitrogenous bases of each strand face each other and complementary bases hydrogen bond to each other, stabilizing the double helix. Heat or chemicals can break the hydrogen bonds between complementary bases, denaturing DNA.

Detailed explanation-3: -Hydrogen bonds in DNA replication are broken down by the helicase class of enzymes. This causes the double-stranded DNA molecule to unzip into two single strands, allowing each strand to be replicated.

Detailed explanation-4: -Helicases are enzymes that are used by living organisms to separate the strands of nucleic acids, and in this case, the double-stranded DNA. Helicases do so by breaking the hydrogen bonds that hold the two strands together.