During DNA replication a primer attaches to a template strand of DNA and begins a new strand. After the primer has attached an enzyme extends the new strand of DNA by adding nucleotides that correspon?

The enzyme responsible for extending the new DNA strand by adding nucleotides is DNA polymerase. It reads the template strand and adds complementary nucleotides to form a new DNA strand. DNA polymerase can only add nucleotides in the 5' to 3' direction.