( ( ( A process ) ( ( in which ) ( substances ( are ( transported ( across ( a plasma ) ) ) ) ) ) ) ( ( membrane ( with ( the ( concentration gradient ) ) ) ) ( with ( the aid ) ) ) )
(ROOT (S (NP (NP (DT A) (NN process)) (SBAR (WHPP (IN in) (WHNP (WDT which))) (S (NP (NNS substances)) (VP (VBP are) (VP (VBN transported) (PP (IN across) (NP (DT a) (NN plasma)))))))) (VP (VBD membrane) (PP (IN with) (NP (DT the) (NN concentration) (NN gradient))) (PP (IN with) (NP (DT the) (NN aid))))))
A process in which substances are transported across a plasma membrane with the concentration gradient with the aid
(ROOT (S (NP (JJ Primary) (JJ active) (NN transport)) (VP (VBZ involves) (NP (NP (DT the) (NN forcing)) (PP (IN of) (NP (DT a) (NN substance)))) (PP (IN into) (NP (NP (DT a) (NN cell)) (PP (IN against) (NP (PRP$ its) (NN concentration) (NN gradient)))))) (. .)))