What reactions are matrix synthesis reactions?

Matrix synthesis reactions are processes in which, on the basis of the initial molecule, other types of molecules necessary for the vital activity of the cell are synthesized. For example:

Doubling of the DNA molecule – matrix synthesis – the matrix (the molecule with which the information is copied) – the DNA molecule itself. That is, when the hydrogen bonds between the turns of the DNA molecule strand are broken, the opposite strand is restored on each of the liberated chains of the molecule. So the molecules become twice as large;
Synthesis of an i-RNA molecule onto one of the untwisted DNA strands;
Formation of a protein molecule on messenger RNA.