( Active ( ( ( Transport ( ( The movement ) ( of ( a substance ) ) ) ) ( across ( ( a membrane ) ( requiring energy ) ) ) ) . ) )
(ROOT (S (NP (NNP Active)) (VP (VBD Transport) (NP (NP (DT The) (NN movement)) (PP (IN of) (NP (DT a) (NN substance)))) (PP (IN across) (NP (NP (DT a) (NN membrane)) (VP (VBG requiring) (NP (NN energy)))))) (. .)))
Active Transport The movement of a substance across a membrane requiring energy.
(ROOT (S (SBAR (WHADVP (WRB When)) (S (NP (NNS substances)) (VP (VBP pass) (PP (IN through) (NP (DT the) (NN cell) (NN membrane))) (PP (IN without) (S (VP (VBG needing) (NP (DT any) (NN energy)))))))) (, ,) (NP (PRP it)) (VP (VBZ is) (VP (VBN called) (NP (JJ passive) (NN transport)))) (. .)))