( ( Each ( amino acid ) ) ( ( has ( ( ( a ( carboxyl group ) ) and ) ( an ( amine group ) ) ) ) . ) )
(ROOT (S (NP (DT Each) (JJ amino) (NN acid)) (VP (VBZ has) (NP (NP (DT a) (JJ carboxyl) (NN group)) (CC and) (NP (DT an) (JJ amine) (NN group)))) (. .)))
Each amino acid has a carboxyl group and an amine group.
(ROOT (S (NP (NNP Amino) (NNS acids)) (VP (VBP contain) (NP (PDT both) (NP (DT a) (JJ carboxylic) (JJ acid) (NN group)) (CC and) (NP (DT a) (-LRB- -LRB-) (NN n) (-RRB- -RRB-) (JJ amine) (NN group)))) (. .)))