DNA

Structure of DNA (watson and crick model)
(a) DNA double Helix,  (b) Detailed structure of the two stands
(c) c-5 and c-3 ends and anti parallel of strands( Diagrammatic)

     DNA is a nucleic acid that constitutes the genes in virtually all living organisms. It governs cell growth and is responsible for the transmission of genetic information information from one generation to the next. A DNA molecule consists of two strands that spiral around each other to form a double helix. The strands are held together by sub units called bases,  which always pair in specific ways: adenine with thymine and  cytosine with guanine.