battledore (plural battledores) 1  A game played with a shuttlecock and rackets (properly battledore and shuttlecock); a forerunner of badminton. 2  The racket used in this game. ( 3 obsolete) A child's hornbook for learning the alphabet. ( obsolete) A bat or beetle used in washing clothes.
Watson is a U.S. molecular biologist, geneticist and zoologist, best known as one of the co-discoverers of the structure of DNA in 1953 with Francis Crick. In 1998, the Modern Library placed The Double Helix at number 7 on its list of the 100 best nonfiction books of the 20th century.
The double helix describes the appearance of double-stranded DNA, which is composed of two linear strands that run opposite to each other, or anti-parallel, and twist together.Each DNA strand within the double helix is a long, linear molecule made of smaller units called nucleotides that form a chain.n 1953, Francis Crick and James Watson first described the molecular structure of DNA, which they called a double helix, in the journal Nature.