<prompt> The Watsons Crick double helix model of DNA isRight handed anti parallelLeft handed anti parallelRight handed parallelLeft handed parallel  <response>: Ans. a Right handed anti parallelRef: Harpers Biochemistry, 30th edn. pg. 360-361 Helical structure assumed by two strands of deoxyribonucleic acid, held together throughout their length by hydrogen bonds between bases on opposite strands, referred to as Watson-Crick base pairing. The structure is right handed anti-parallel structure. 