DNA Structure. ­DNA is o­ne of the nucleic acids, information-containing molecules in the cell (ribonucleic acid, or RNA, is the other nucleic acid). DNA is found in the nucleus of every human cell. (See the sidebar at the bottom of the page for more about RNA and different types of cells).The information in DNA:1  guides the cell (along with RNA) in making new proteins that determine all of our biological traits.NA is found in the nucleus of every human cell. (See the sidebar at the bottom of the page for more about RNA and different types of cells). The information in DNA: 1  guides the cell (along with RNA) in making new proteins that determine all of our biological traits.