Here's why:

* Nucleus: The nucleus is the control center of the cell, and it houses the cell's genetic material. This genetic material is organized into long, thread-like structures called chromosomes, which are composed of DNA.

* Mitochondria: While the majority of DNA is in the nucleus, there is a small amount of DNA found in the mitochondria. This is called mitochondrial DNA (mtDNA) and is separate from the nuclear DNA. mtDNA has its own role in cellular energy production.

So, while the nucleus is the primary location for DNA in a cell, there's also a small amount of DNA found in the mitochondria.