( ( cell ( ( structure and ) ( membrane biology ) ) ) . )
(ROOT (NP (NP (NN cell)) (NP (NP (NN structure)) (CC and) (NP (JJ membrane) (NN biology))) (. .)))
cell structure and membrane biology.
(ROOT (S (NP (JJ Biological) (NNS membranes)) (VP (VP (VBP surround) (NP (NNS cells))) (CC and) (VP (VBP serve) (S (VP (TO to) (VP (VB keep) (NP (NP (DT the) (NNS insides)) (VP (VBN separated) (PP (IN from) (NP (DT the) (NNS outsides)))))))))) (. .)))