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  • DNA double helix
  • DNA double helix
  • DNA double helix
  • DNA double helix
  • DNA double helix
  • DNA double helix
  • DNA double helix
  • DNA double helix
  • DNA double helix
  • DNA double helix
  • DNA double helix
  • DNA double helix
  • Four-helix bundles, myohaemerythrin
  • Several varieties of field snail (Helix hortensis). Colour reproduction of a painting by L. F. Muckley.
  • DNA double helix and sequencing output
  • DNA double helix and sequencing output
  • DNA double helix and sequencing output
  • DNA double helix and sequencing output
  • DNA double helix and sequencing output
  • Ilex aquifolium (Holly) Hedera helix (Ivy)
  • 53 in the form of a double helix
  • Shadow of a DNA double helix on sequencing output
  • Pencil sketch of the DNA double helix by Francis Crick. It shows a right-handed helix and the nucleotides of the two anti-parallel strands.
  • Model of a DNA double helix according to the correct dimensions of the natural molecule.
  • Model of a DNA double helix according to the correct dimensions of the natural molecule.
  • Model of a DNA double helix according to the correct dimensions of the natural molecule.
  • Illustration depicting semi-conservative DNA replication. Three generations of DNA are shown. After separation of the DNA double helix, two new complementary DNA strands are synthesised (indicated by a new colour). Complementary base pairing and hydrogen bonding results in formation of a new double helix.
  • English ivy (Hedera helix): stem with flowers, fruit and leaves. Coloured lithograph by W. G. Smith, c. 1863, after himself.
  • English ivy (Hedera helix): stem with flowers, fruit and leaves. Coloured lithograph by W. G. Smith, c. 1863, after himself.
  • Illustration of the DNA double helix. The sugar-phosphate backbone of the two complementary strands are visible (red and blue).