( DNA ( ( ( exists ( in cell ) ) ( as ( ( a ( double helix ) ) ( containing ( ( two ( intertwined chains ) ) ( of nucleotides ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP DNA)) (VP (VBZ exists) (PP (IN in) (NP (NN cell))) (PP (IN as) (NP (NP (DT a) (JJ double) (NN helix)) (VP (VBG containing) (NP (NP (CD two) (JJ intertwined) (NNS chains)) (PP (IN of) (NP (NNS nucleotides)))))))) (. .)))
DNA exists in cell as a double helix containing two intertwined chains of nucleotides.
(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)))))) (. .)))