DNA. association Transcription. Diagram http://www.accessexcellence.org/AB/GG/dna_molecule.html has_part Exon. has_part Intron. has_part Nucleotide. History http://library.thinkquest.org/20830/Textbook/HistoryofDNAResearch.htm Stands for Deoxyribo Nucleic Acid      Vr.154, Jan 2009     Readme