( ( ( DNA consists ) ( of ( ( two ( long polymers ) ) ( of ( simple units ) ) ) ) ) ( ( ( ( called nucleotides ) , ) ( with ( backbones ( made ( of ( ( sugars ( and ( phosphate groups ) ) ) ( joined ( by ( ester bonds ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP DNA) (NNP consists)) (PP (IN of) (NP (NP (CD two) (JJ long) (NNS polymers)) (PP (IN of) (NP (JJ simple) (NNS units)))))) (VP (VBD called) (NP (NNS nucleotides)) (, ,) (PP (IN with) (NP (NP (NNS backbones)) (VP (VBN made) (PP (IN of) (NP (NP (NNS sugars) (CC and) (NN phosphate) (NNS groups)) (VP (VBN joined) (PP (IN by) (NP (NN ester) (NNS bonds)))))))))) (. .)))
DNA consists of two long polymers of simple units called nucleotides, with backbones made of sugars and phosphate groups joined by ester bonds.
(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)))))) (. .)))