Final answer:
Helicase is the enzyme that unzips the DNA at the beginning of replication.
Step-by-step explanation:
The enzyme that unzips the DNA at the beginning of replication is helicase. Helicase is responsible for breaking the hydrogen bonds between the DNA strands, allowing them to separate and form a replication fork. This process is essential for DNA replication to occur.
Learn more about Enzyme involved in DNA replication