_____ are the enzymes which unwind DNA.

Sure! Here are the step-by-step solutions for understanding Helicase: 1. Helicase is an enzyme that is responsible for unwinding the double-stranded DNA molecule during replication. 2. It binds to the DNA strand at a specific site called the origin of replication. 3. It uses energy from ATP hydrolysis to break the hydrogen bonds between the base pairs of the two DNA strands. 4. As the helicase unwinds the DNA, it creates a replication fork, which is a Y-shaped structure. 5. The two strands of DNA are separated and become the template for the synthesis of new complementary strands. 6. The leading strand is synthesized continuously in the 5' to 3' direction. 7. The lagging strand is synthesized in short fragments called Okazaki fragments, which are later joined together by DNA ligase. 8. Helicase continues to unwind the DNA ahead of the replication fork until the entire DNA molecule has been replicated. 9. Helicase is an essential enzyme in DNA replication and is found in all living organisms.