In the process of semi-conservative replication:

Explanation

In the process of semi-conservative replication, the primary structure is conserved. The primary structure of DNA refers to the sequence of nucleotides along the DNA strand, and this sequence is faithfully maintained in the newly synthesised DNA strands. Each original DNA strand serves as a template for the synthesis of a complementary strand, preserving the primary structure. The secondary structure, which is the double helical structure, is disrupted temporarily during replication but is reformed as the new strands are synthesised.