( ( ( ( ( Active transport ) , ) ( ( requires energy ) ( -LRB- ( ATP -RRB- ) ) ) ) , ) ( ( transports ( against ( concentration gradient ) ) ) ; ) )
(ROOT (S (NP (NP (JJ Active) (NN transport)) (, ,) (NP (NP (JJ requires) (NN energy)) (PRN (-LRB- -LRB-) (NP (NNP ATP)) (-RRB- -RRB-))) (, ,)) (VP (VBZ transports) (PP (IN against) (NP (NN concentration) (NN gradient)))) (: ;)))
Active transport, requires energy (ATP), transports against concentration gradient;
(ROOT (S (NP (NNP Passive) (NN transport)) (VP (VP (VBZ requires) (NP (DT no) (NN energy))) (CC and) (VP (VBZ occurs) (SBAR (WHADVP (WRB when)) (S (NP (NNS substances)) (VP (VBP move) (PP (IN from) (NP (NP (NNS areas)) (PP (IN of) (NP (NP (JJR higher)) (PP (TO to) (NP (JJR lower) (NN concentration)))))))))))) (. .)))