( ( DNA molecules ) ( ( have ( ( two ( long chains ) ) ( of ( nucleotides ( intertwined ( to ( form ( a ( double helix ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NN DNA) (NNS molecules)) (VP (VBP have) (NP (NP (CD two) (JJ long) (NNS chains)) (PP (IN of) (NP (NP (NNS nucleotides)) (VP (VBN intertwined) (S (VP (TO to) (VP (VB form) (NP (DT a) (JJ double) (NN helix)))))))))) (. .)))
DNA molecules have two long chains of nucleotides intertwined to form a double 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)))))) (. .)))