1. The Nucleus: This is the main repository of DNA in a eukaryotic cell. The DNA is organized into chromosomes, which are long, thread-like structures made up of DNA and proteins. The nucleus provides a protected environment for the DNA, safeguarding it from damage and allowing for organized replication and transcription.
2. Mitochondria: While most of the cell's DNA is housed in the nucleus, mitochondria, which are the powerhouses of the cell, also contain their own small, circular DNA molecules called mitochondrial DNA (mtDNA). This mtDNA encodes for a limited number of proteins essential for mitochondrial function.
So, while the nucleus is the primary location for DNA in a cell with a nucleus, mitochondria also contain their own DNA.
