41. DNA is the famous double helix , two long spirals joined by a giant spiral staircase. 42. In his 1968 best-selling book " The Double Helix ," 43. Agora Garden is composed of twenty levels in double helix formation, twisted at ninety degrees. 44. The tiny double helix has outlasted the mightiest mountains. 45. "The Double Image of the Double Helix " and " Science and the Unborn ." 46. The DNA or RNA of viruses consists of either a single strand or a double helix . 47. This saga of DNA meets real world is about as mysterious as the double helix itself. 48. The double helix then separates into two single strands which are in the random coiled conformation. 49. The DNA molecule is a double helix , resembling a ladder that's been twisted along its length. 50. He supplied the journal's first drawings of Sputniks in orbit, continental drift and DNA double helixes .
