( ( ( ( nucleic acid ) -- ) ( ( class ( of ( biochemical compounds ) ) ) ( which ( includes ( ( DNA and ) RNA ) ) ) ) ) . )
(ROOT (NP (NP (JJ nucleic) (NN acid)) (: --) (NP (NP (NN class)) (PP (IN of) (NP (JJ biochemical) (NNS compounds))) (SBAR (WHNP (WDT which)) (S (VP (VBZ includes) (NP (NNP DNA) (CC and) (NNP RNA)))))) (. .)))
nucleic acid -- class of biochemical compounds which includes DNA and RNA.
(ROOT (S (NP (NNP Rna) (CC and) (NNP dna)) (VP (VBP are) (NP (NP (NNS types)) (PP (IN of) (NP (NP (JJ nucleic) (NNS acids)) (VP (VBG containing) (NP (NP (DT the) (NNS elements)) (NP (NN carbon) (, ,) (NN hydrogen) (, ,) (NN oxygen) (, ,) (NN nitrogen) (, ,) (CC and) (NN phosphorus)))))))) (. .)))