( ( The ( Cell Wall ) ) ( ( is ( ( a structure ) ( surrounding ( the ( plasma membrane ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NNP Cell) (NNP Wall)) (VP (VBZ is) (NP (NP (DT a) (NN structure)) (VP (VBG surrounding) (NP (DT the) (NN plasma) (NN membrane))))) (. .)))
The Cell Wall is a structure surrounding the plasma membrane.
(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))))) (. .)))