To finish the process, an enzyme catalyzes new strand production.  
Double strands of DNA are denatured into single strands and primers are added to their 3' (three prime) ends.  To finish the process, an enzyme catalyzes new strand production.  It wasn't feasible until Kerry Mullis discovered the Themus aquaticus bacteria, which had the proper metabolic machinery and resistance to high temperatures. For ten points, what process geometrically increases the number of copies of a particular DNA sequence?
Double strands of DNA are denatured into single strands and primers are added to their 3' (three prime) ends.  
Polymerase Chain Reaction