( DNA ( ( consists ( of ( ( two ( long ( ( chains or ) strands ) ) ) ( that ( ( wrap around ) ( ( each other ) ( in ( ( a shape ) ( known ( as ( a ( double-stranded ( spiral helix ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP DNA)) (VP (VBZ consists) (PP (IN of) (NP (NP (CD two) (JJ long) (NNS chains) (CC or) (NNS strands)) (SBAR (WHNP (WDT that)) (S (VP (VB wrap) (PRT (RP around)) (NP (NP (DT each) (JJ other)) (PP (IN in) (NP (NP (DT a) (NN shape)) (VP (VBN known) (PP (IN as) (NP (DT a) (JJ double-stranded) (NN spiral) (NN helix))))))))))))) (. .)))
DNA consists of two long chains or strands that wrap around each other in a shape known as a double-stranded spiral helix.
(ROOT (S (NP (NNP Dna)) (VP (VBZ consists) (PP (IN of) (NP (NP (CD two) (JJ long) (NNS chains)) (PP (IN of) (NP (NNS nucleotides)))))) (. .)))