Question

what is the role of dna helicase in dna replication? copying base pairs unwinding and separating dna lining up dna polymerase

Explanation:

To determine the role of DNA helicase in DNA replication, we analyze each option:

• "copying base pairs" is the role of DNA polymerase, not helicase.
• "unwinding and separating DNA" matches the known function of DNA helicase, which breaks the hydrogen bonds between base pairs to open the double helix during replication.
• "lining up DNA polymerase" is not a function of helicase.

Answer:

B. unwinding and separating DNA (assuming the middle option is labeled B; if the options are unlabeled, the middle option with "unwinding and separating DNA")