Where is DNA stored?

Ribosomes are the cellular structures responsible for protein synthesis, translating messenger RNA (mRNA) into polypeptide chains. They do not contain DNA; instead, they utilize the genetic information encoded in mRNA, which is transcribed from DNA located in the nucleus, thus serving a different function within the cell.

The endoplasmic reticulum (ER) functions primarily in the synthesis and processing of proteins and lipids. While it is involved in the production of molecules that may be influenced by DNA, it does not serve as a storage site for DNA. Instead, it operates as a network for transporting proteins synthesized by ribosomes.

Mitochondria contain their own DNA, which is distinct from nuclear DNA and is involved in coding for certain proteins necessary for mitochondrial function. However, the primary storage of genetic information in a cell resides in the nucleus, making the mitochondria a secondary site for a small amount of cellular DNA.