( ( ( A ( single subunit ) ) ( of DNA ) ) ( ( ( ( is ( called ( a nucleotide ) ) ) and ) ( consists ( of ( ( ( ( ( ( a ( nitrogen-containing base ) ) , ) ( a sugar ) ) , ) and ) ( a ( phosphate group ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT A) (JJ single) (NN subunit)) (PP (IN of) (NP (NNP DNA)))) (VP (VP (VBZ is) (VP (VBN called) (NP (DT a) (NN nucleotide)))) (CC and) (VP (VBZ consists) (PP (IN of) (NP (NP (DT a) (JJ nitrogen-containing) (NN base)) (, ,) (NP (DT a) (NN sugar)) (, ,) (CC and) (NP (DT a) (JJ phosphate) (NN group)))))) (. .)))
A single subunit of DNA is called a nucleotide and consists of a nitrogen-containing base, a sugar, and a phosphate group.
(ROOT (S (NP (NP (DT The) (NN base)) (PP (IN of) (NP (NP (DT a) (NN nucleotide)) (PP (IN within) (NP (NN dna)))))) (VP (VBZ consists) (PP (IN of) (NP (NN nitrogen)))) (. .)))