50.0 MB (3.4 MB compressed)
3696 x 4730 pixels
31.2 x 40.1 cm ⏐ 12.3 x 15.8 in (300dpi)
LAWRENCE LAWRY / SCIENCE PHOTO LIBRARY LAWRENCE LAWRY / SCIENCE PHOTO LIBRARY
DNA helix. Hand holding a model of a double helix of DNA (deoxyribonucleic acid), which is formed of spiralling paired strands of sugar phosphates that are linked by nucleotide base pairs. There are four bases: adenine, thymine, guanine & cytosine (coloured links) that when paired form struts, as on a ladder. The arrangement of the bases along a helix of DNA is the genetic code for protein synthesis and the functioning & growth of every living organism. DNA is found in cell nuclei.
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