During DNA replication, the two strands of the original DNA molecule are separated, and each strand serves as a template for the synthesis of a new complementary strand. These sections of DNA are called:

* Leading Strand: This strand is synthesized continuously in the 5' to 3' direction, following the movement of the replication fork.

* Lagging Strand: This strand is synthesized discontinuously in the 5' to 3' direction, in short fragments called Okazaki fragments, which are later joined together by DNA ligase.

Therefore, while the entire DNA molecule is replicated, the process is divided into these two distinct sections or strands.