Question - What is DNA?
Answer -
In most living organisms, DNA is the genetic material except for some viruses such as the AIDS and the Tobacco mosaic virus where RNA is the genetic material. DNA and RNA belong to a category of macromolecules known as nucleic acids. The structure of DNA was proposed by Watson and Crick in the year 1953.
A DNA molecule is a long chain polymer composed of monomeric units called nucleotides. Therefore, a DNA molecule is made of a polynucleotide chain. Each nucleotide is made of a deoxyribose sugar molecule, a phosphoric acid group and nitrogen bases.