( ( type ( of ( active transport ) ) ) ( ( in which ) ( substances ( are ( ( carried ( across ( the ( cell membrane ) ) ) ) ( by vesicles ) ) ) ) ) )
(ROOT (FRAG (NP (NP (NN type)) (PP (IN of) (NP (JJ active) (NN transport)))) (SBAR (WHPP (IN in) (WHNP (WDT which))) (S (NP (NNS substances)) (VP (VBP are) (VP (VBN carried) (PP (IN across) (NP (DT the) (NN cell) (NN membrane))) (PP (IN by) (NP (NNS vesicles)))))))))
type of active transport in which substances are carried across the cell membrane by vesicles
(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)))) (. .)))