( ( ( ( Subcellular transport ) ( of ( ions ( , ( ( electrons and ) molecules ) ) ) ) ) ( such ( as ( ( water and ) enzymes ) ) ) ) ( ( occurs ( across ( cell membranes ) ) ) . ) )
(ROOT (S (NP (NP (JJ Subcellular) (NN transport)) (PP (IN of) (NP (NNS ions) (, ,) (NNS electrons) (CC and) (NNS molecules))) (PP (JJ such) (IN as) (NP (NN water) (CC and) (NNS enzymes)))) (VP (VBZ occurs) (PP (IN across) (NP (NN cell) (NNS membranes)))) (. .)))
Subcellular transport of ions, electrons and molecules such as water and enzymes occurs across cell membranes.
(ROOT (S (NP (DT The) (NN term) (JJ passive) (NN transport)) (VP (VBZ describes) (NP (DT a) (NN way)) (SBAR (IN that) (S (NP (JJ small) (NNS molecules) (CC or) (NNS ions)) (VP (VBP move) (PP (IN across) (NP (NP (DT the) (NN cell)) (VP (VBN membrane) (PP (IN without) (NP (NP (NN input)) (PP (IN of) (NP (NN energy))))) (PP (IN by) (NP (DT the) (NN cell)))))))))) (. .)))