DNA replication occurs in which cellular compartment?

DNA replication occurs in which cellular compartment?

• A. Nucleus
• B. Cytoplasm
• C. Mitochondria
• D. Ribosome

Answer: (A)

In eukaryotic cells, DNA replication happens in the nucleus because that is where the cell’s chromosomes are stored as chromatin and where the replication machinery operates to copy the nuclear genome before cell division. The nuclear envelope helps coordinate replication with chromatin structure, ensuring accurate and orderly duplication of the genetic material. The other options don’t fit the main site of replication: ribosomes are the site of protein synthesis; the cytoplasm is the general interior where many processes occur but the nuclear genome is housed in the nucleus; mitochondria do replicate their own separate, circular genome inside the mitochondria itself. So the nucleus is the correct site for replicating the nuclear DNA.

In eukaryotic cells, DNA replication happens in the nucleus because that is where the cell’s chromosomes are stored as chromatin and where the replication machinery operates to copy the nuclear genome before cell division. The nuclear envelope helps coordinate replication with chromatin structure, ensuring accurate and orderly duplication of the genetic material. The other options don’t fit the main site of replication: ribosomes are the site of protein synthesis; the cytoplasm is the general interior where many processes occur but the nuclear genome is housed in the nucleus; mitochondria do replicate their own separate, circular genome inside the mitochondria itself. So the nucleus is the correct site for replicating the nuclear DNA.