( ( Have students ) ( ( describe ( ( cellular barriers ) ( -LRB- ( ( ( ( plasma membranes ) , ) ( cell walls ) ) -RRB- ) ) ) ) . ) )
(ROOT (S (NP (JJ Have) (NNS students)) (VP (VBP describe) (NP (NP (JJ cellular) (NNS barriers)) (PRN (-LRB- -LRB-) (NP (NP (NN plasma) (NNS membranes)) (, ,) (NP (NN cell) (NNS walls))) (-RRB- -RRB-)))) (. .)))
Have students describe cellular barriers (plasma membranes, cell walls).
(ROOT (S (NP (JJ Prokaryotic) (NNS cells)) (VP (VBP have) (NP (NP (DT a) (NN cell) (NN wall)) (PP (IN outside) (NP (PRP$ their) (NN plasma) (NN membrane))))) (. .)))