Question

What is the role of DNA helicase during DNA replication? A. To unwind the duplex DNA B. To attach primers to the replicating strands C. To add bases in the sugar-phosphate backbone

Answer 1

A

Step-by-step explanation:

DNA Helicase 1)unwinds and 2)unzips the double stranded DNA molecule by breaking the hydrogen bonds between complementary nitrogenous bases.

Primase catalyses the addition of primers to DNA to provide a 3'-OH group that DNA polymerase can add free deoxyribonucleotides (or deoxyribonucleoside triphosphate) to elongate the primers during DNA replication.

DNA polymerase catalyses the addition of free DNA nucleotides to complementary bases and catalyses the formation of phosphodiester bonds between 3'-OH group of a DNA nucleotide and 5'-phosphate group of another DNA nucleotide.