- The primary role of DNA in cellular biology is the storage of genetic information.
- DNA contains the instructions needed for the development, functioning, growth, and reproduction of all living organisms.
- This genetic information is encoded in the sequence of nucleotide bases (adenine, thymine, cytosine, and guanine).

- While DNA is crucial for protein synthesis regulation, its main function is to serve as a stable repository of hereditary information, which can be accurately copied and passed on during cell division.

- DNA itself is not involved in energy production in mitochondria—this role is primarily carried out by mitochondrial enzymes and molecules like ATP.
- Additionally, DNA does not provide structural support to the cell membrane; this function is maintained by proteins and lipids within the membrane.

Reference: Molecular Biology of the Cell, 6th Edition, Chapter 3, Page 94