In which organelle of a eukaryotic cell does DNA replication take place?

DNA replication occurs in the nucleus of a eukaryotic cell. The nucleus houses the cell's genetic material, organized as chromatin, which condenses into chromosomes during cell division. The process of DNA replication involves unwinding the double helix structure of the DNA, allowing the enzyme DNA polymerase to synthesize a new complementary strand for each original strand. This replication is crucial for cell division and occurs before a cell divides to ensure that each daughter cell receives a complete set of genetic information.

Other organelles, like mitochondria, are involved in energy production and also contain some DNA, but the primary site for replication of the genetic material required for cellular functions is the nucleus. Ribosomes are involved in protein synthesis, while the endoplasmic reticulum plays a role in the synthesis and transport of proteins and lipids, but neither are involved in the replication of DNA.