( ( ( ( ( ( Each ( amino acid ) ) ( has ( ( ( a ( carboxyl group ) ) and ) ( an ( amine group ) ) ) ) ) , ) and ) ( ( amino acids ) ( ( link ( to ( one another ) ) ) ( to ( ( ( form ( a chain ) ) ( by ( a ( dehydration reaction ) ) ) ) ( by ( ( joining ( ( the ( amine group ) ) ( of ( one ( amino acid ) ) ) ) ) ( to ( ( the ( carboxyl group ) ) ( of ( the next ) ) ) ) ) ) ) ) ) ) ) . )
(ROOT (S (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))))) (, ,) (CC and) (S (NP (JJ amino) (NNS acids)) (VP (VBP link) (PP (TO to) (NP (CD one) (DT another))) (S (VP (TO to) (VP (VB form) (NP (DT a) (NN chain)) (PP (IN by) (NP (DT a) (NN dehydration) (NN reaction))) (PP (IN by) (S (VP (VBG joining) (NP (NP (DT the) (JJ amine) (NN group)) (PP (IN of) (NP (CD one) (JJ amino) (NN acid)))) (PP (TO to) (NP (NP (DT the) (JJ carboxyl) (NN group)) (PP (IN of) (NP (DT the) (JJ next))))))))))))) (. .)))
Each amino acid has a carboxyl group and an amine group, and amino acids link to one another to form a chain by a dehydration reaction by joining the amine group of one amino acid to the carboxyl group of the next.
(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)))) (. .)))