Question

a. what type of biological molecule is dna helicase?
b. what is the role of dna helicase in the replication of dna?

Explanation:

a. DNA helicase is an enzyme. Enzymes are proteins that act as biological catalysts.
b. In DNA replication, DNA helicase unwinds the double - stranded DNA. It breaks the hydrogen bonds between the complementary base pairs, creating a replication fork. This allows other replication machinery (such as DNA polymerase) to access the single - stranded DNA templates for replication.

Answer:

a. DNA helicase is a protein (enzyme).
b. The role of DNA helicase in DNA replication is to unwind the double - stranded DNA by breaking hydrogen bonds between base pairs, creating a replication fork.