Florence (Firenze) 10 day weather forecast, updated four times a day and shows the weather summary plus detailed sun, rain, snow, wind and temperature. The weather forecast extends out to 10 days showing information for morning, afternoon and overnight.
Definition of double helix. : a helix or spiral consisting of two strands in the surface of a cylinder that coil around its axis; especially : the structural arrangement of DNA in space that consists of paired polynucleotide strands stabilized by cross-links between purine and pyrimidine bases â compare alpha-helix, watson-crick model.
The double helix in genetics describes the shape of the genetic material known as DNA. The double helix resembles a ladder that is twisted into a spiral. The upright portion of the DNA is composed of sugar and phosphate, and the rungs are nucleotides called adenine, thymine, guanine and cytosine. Full Answer >.