Question

Why does DNA polymerase proofread the new strand?

Answer 1

During DNA replication (copying), most DNA polymerases can “check their work” with each base that they add. This process is called proofreading. ... DNA polymerase adds a new base to the 3' end of the growing, new strand. (The template has a G, and the polymerase incorrectly adds a T rather than a C to the new strand.)

Answer 2

During DNA replication (copying), most DNA polymerases can “check their work” with each base that they add. This process is called proofreading. ... DNA polymerase adds a new base to the 3' end of the growing, new strand. (The template has a G, and the polymerase incorrectly adds a T rather than a C to the new strand.)