CHRISTIAN DARKIN / SCIENCE PHOTO LIBRARY CHRISTIAN DARKIN / SCIENCE PHOTO LIBRARY
Destruction of DNA helix. The computer artwork may represent the breakdown of DNA during an explosion or the destruction of DNA in hot, molten lava. A molecule of DNA (deoxyribonucleic acid) consists of two helical strands coiled around the same axis. There are four nucleotide bases that hold the two helical strands in a double helix; adenine (A), cytosine (C), guanine (G) and thymine (T). The sequence of the bases in the molecule forms the genetic code.
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