Part D - Unwinding the DNA As DNA replication continues and the replication bubble expands, the parental double helix is unwound and separated into its two component strands. This unwinding and separating of the DNA requires three different types of proteins: helicase, topoisomerase, and single-strand binding proteins. Sort the phrases into the appropriate bins depending on which protein they describe. binds at the replication fork helicase binds after the replication fork binds ahead of the replication fork breaks H-bonds between bases prevents H-bonds between bases topoisomerase breaks covalent bonds in DNA backbone single-strand binding protein reset ? help