Here's why:
* Mitochondrial DNA (mtDNA): Mitochondria have their own circular DNA molecule, separate from the nuclear DNA. This mtDNA encodes for some of the proteins necessary for mitochondrial function.
* Mitochondrial RNA (mtRNA): Mitochondria also transcribe their own RNA molecules, including messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA), which are involved in protein synthesis within the mitochondria.
It's important to note that while mitochondria contain both DNA and RNA, they are not considered to be true "nuclei" because they lack the complex nuclear envelope and other structures associated with the nucleus.