MICHAEL DUNNING / SCIENCE PHOTO LIBRARY MICHAEL DUNNING / SCIENCE PHOTO LIBRARY
DNA. Computer artwork of a DNA molecule on a starfield with a flash of light. DNA (deoxyribo- nucleic acid) is the molecule which carries the genetic code. It is found in all living things, and controls growth and development. It comprises two spiral sugar-phosphate strands joined by cross-linking bases (vertical). Four types of base are found in DNA, and their order on the strands determines an organism's characteristics.
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