What is the role of dna helicase during dna replication?
to unwind the duplex dna
to attach primers to the replicating strands
to add bases in the sugar-phosphate backbone

The correct answer is to unwind the duplex DNA.

Explanation:

DNA helicase is the first essential enzymes during replication which unwinds the double stranded DNA at the origin of replication.

DNA helicase works in a manner as follows:

1. Helicase binds to the origin of replication where synthesis will start.

2. Enzyme starts unwinding the double-stranded DNA by melting the hydrogen bonds between them using energy in the form of ATP.

3. Enzyme continues the process of unwinding the DNA by forming a structure called the replication fork.

Thus, the correct answer is to unwind the duplex DNA.

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