DNA model described by Watson and Crick was
Right handed parallel
Left handed anti parallel
Right handed anti parallel
Right handed parallel
The DNA molecule consists of two polynucleotide chains or strands that spirally twisted around each other and coiled around a common axis to form a right-handed double-helix. The two strands are antiparallel i.e. they ran in opposite directions so that the 3' end of one chain facing the 5' end of the other. The sugar-phosphate backbones remain on the outside, while the core of the helix contains the purine and pyrimidine bases. Ref-Sathyanarayana 4/e p400
Metabolism of nucleic acids