( ( The ( plasma membrane ) ) ( ( has ( ( ( ( ( ( several functions ) , ) ( the ( ( most important ) ( being transport ) ) ) ) , ) ( which ( ( is ( ( the moving ) ( of ( water-soluble substances ) ) ) ) ( ( in and ) out ) ) ) ) ( of ( the cell ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN plasma) (NN membrane)) (VP (VBZ has) (NP (NP (NP (JJ several) (NNS functions)) (, ,) (NP (DT the) (ADJP (RBS most) (JJ important)) (JJ being) (NN transport)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBZ is) (NP (NP (DT the) (NN moving)) (PP (IN of) (NP (JJ water-soluble) (NNS substances)))) (ADVP (IN in) (CC and) (IN out)))))) (PP (IN of) (NP (DT the) (NN cell))))) (. .)))
The plasma membrane has several functions, the most important being transport, which is the moving of water-soluble substances in and out of the cell.
(ROOT (S (NP (NNP Passive) (NN transport)) (VP (VBZ occurs) (SBAR (WHADVP (WRB when)) (S (NP (NNS substances)) (VP (VBP cross) (NP (DT the) (NN plasma) (NN membrane)) (PP (IN without) (NP (NP (DT any) (NN input)) (PP (IN of) (NP (NN energy))))) (PP (IN from) (NP (DT the) (NN cell))))))) (. .)))