( ( In ( some instances ) ) ( , ( ( active transport ) ( ( helps ( ( ( molecules and ) ions ) ( to ( ( penetrate ( the ( cell membrane ) ) ) ( despite ( ( the resistance ) ( of ( electrochemical forces ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN In) (NP (DT some) (NNS instances))) (, ,) (NP (JJ active) (NN transport)) (VP (VBZ helps) (S (NP (NNS molecules) (CC and) (NNS ions)) (VP (TO to) (VP (VB penetrate) (NP (DT the) (NN cell) (NN membrane)) (PP (IN despite) (NP (NP (DT the) (NN resistance)) (PP (IN of) (NP (JJ electrochemical) (NNS forces))))))))) (. .)))
In some instances, active transport helps molecules and ions to penetrate the cell membrane despite the resistance of electrochemical forces.
(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)))))))))) (. .)))