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DNA    n 
deoxyribonucleic acid; a nucleic acid that is the main constituent of the chromosomes of all organisms (except some viruses). The DNA molecule consists of two polynucleotide chains in the form of a double helix, containing phosphate and the sugar deoxyribose and linked by hydrogen bonds between the complementary bases adenine and thymine or cytosine and guanine. DNA is self-replicating, plays a central role in protein synthesis, and is responsible for the transmission of hereditary characteristics from parents to offspring 
See also  →  genetic code 
complementary DNA    n 
a form of DNA artificially synthesized from a messenger RNA template and used in genetic engineering to produce gene clones, (Abbrev.)  cDNA 
DNA fingerprinting , profiling  n another name for  →  genetic fingerprinting 
recombinant DNA    n 
DNA molecules that are extracted from different sources and chemically joined together; for example DNA comprising an animal gene may be recombined with DNA from a bacterium