( ( Nucleic acids ) ( ( can ( be ( thousands ( of ( nucleotides long ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Nucleic) (NNS acids)) (VP (MD can) (VP (VB be) (NP (NP (NNS thousands)) (PP (IN of) (NP (NP (NNS nucleotides)) (ADVP (RB long))))))) (. .)))
Nucleic acids can be thousands of nucleotides long.
(ROOT (S (NP (JJ Individual) (NNS nucleotides)) (VP (MD can) (VP (VB be) (VP (VBN linked) (ADVP (RB together)) (PP (IN through) (NP (PRP$ their) (JJ phosphate) (NNS groups))) (S (VP (TO to) (VP (VB form) (NP (JJ nucleic) (NN acid) (NNS polymers)))))))) (. .)))