( ( Other proteins ) ( ( ( transport molecules ) ( across ( cell membranes ) ) ) . ) )
(ROOT (S (NP (JJ Other) (NNS proteins)) (VP (VB transport) (NP (NNS molecules)) (PP (IN across) (NP (NN cell) (NNS membranes)))) (. .)))
Other proteins transport molecules 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)))))))))) (. .)))