Here's a breakdown:
* DNA Replication: The process of copying a DNA molecule to produce two identical DNA molecules.
* Nucleus: The organelle within eukaryotic cells that contains the genetic material (DNA).
* Nucleotides: The building blocks of DNA, consisting of a sugar, a phosphate group, and a nitrogenous base (adenine, guanine, cytosine, or thymine).
During DNA replication, the existing DNA strands act as templates for the synthesis of new strands. Enzymes like DNA polymerase use free nucleotides found in the nucleus to build the new strands, following the base pairing rules (A with T, and G with C).