Question

what enzyme is responsible for creating new covalent bonds that connect the sugar phosphate backbone of the new dna molecule

Answer 1

So you're talking about DNA replication.

This is a question that asks for a fact. No real brain work to do. I can just give you the name of the protein. It is called Polymerase.

There are all kinds of polymerases. Ones that form RNA out of DNA, ones that form DNA out of DNA, and even those that form DNA out of RNA.