Which enzymes are responsible for copying and repairing DNA strands during replication?

The correct answer identifies DNA polymerase and ligase as key enzymes involved in the processes of copying and repairing DNA strands during replication.

DNA polymerase is essential for synthesizing new DNA strands by adding nucleotides complementary to the template strand. This enzyme plays a critical role in copying the genetic information and ensuring accurate duplication during cell division.

Ligase, on the other hand, is involved in joining together fragments of DNA. Specifically, during replication, especially on the lagging strand, DNA is made in short segments known as Okazaki fragments. Ligase connects these fragments, sealing the nicks between them and creating a continuous strand of DNA.

Combining the actions of DNA polymerase and ligase ensures that not only is DNA replicated accurately, but any necessary repairs to the DNA are also effectively executed to maintain genomic integrity.